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Re: Can You Solve This Math That Baffled Australian Students? by iyke2ken(m): 12:59pm On Nov 04, 2015
babseg:
What's the answer


Half of a polygon is equal to the regular size of the circle. The angle marked x is equivalently attached to the total degrees in a circle which is equal to 360. When you check the obtuse angle created when the two fifty cents meet ( although I think there is just one fifty cent). X is equals to 60 degrees if you look at it head on.. But turn it to the side and x could be 30 degrees.




*deep sigh*


Honestly, I do not know the answer. I just copied that guy that said 60 degrees

2 Likes 1 Share

Re: Can You Solve This Math That Baffled Australian Students? by dustydee: 12:59pm On Nov 04, 2015
EverestdeBliu:
Total angles in a circle = 360
Number of sides = 12
X = 360 ÷ 12
X = 30
Therefore,angle x is equals 30 degrees.
I agree, the only angle marked out on the image is 30 degrees. I do not know which "x" the others are solving for other than what is indicated.

3 Likes

Re: Can You Solve This Math That Baffled Australian Students? by Nobody: 1:00pm On Nov 04, 2015
It be like studio dey for my head by the time i solved it..... But thank God i don come bk to life... I need to hold a thanksgiving.. Bt on fact 30 degree is the correct answer there is a indicator that the 60 degree is divided.

2 Likes

Re: Can You Solve This Math That Baffled Australian Students? by proudly9ja(m): 1:00pm On Nov 04, 2015
ChokolateBoss:


Obviously a polygon. A circle doesn't have sides

A circle has infinite number of sides
Re: Can You Solve This Math That Baffled Australian Students? by 3kay945(m): 1:01pm On Nov 04, 2015
Am here to give likes regardless of your answer, inasmuch you give fairly reasonable argument. wink
Re: Can You Solve This Math That Baffled Australian Students? by Moderation: 1:05pm On Nov 04, 2015
The triangle formed is equaleteral; therefore the three angles are equal. X = 60 degrees.

2 Likes

Re: Can You Solve This Math That Baffled Australian Students? by ibnjarir93(m): 1:06pm On Nov 04, 2015
holocron:
This is JSS geometry.

D) 60deg. Angles in a circle = 360. Since there are 12 chords, angle at the inside of each chord triangle is 30, the sides of the chords 75 each (angle inside triangle = 180). Including the ones on the other coin = 75×4 = 300. So x is 60. (Angle round a circle is 360deg)
Bro this isn't a circle but a polygon.
Re: Can You Solve This Math That Baffled Australian Students? by tunde1200(m): 1:07pm On Nov 04, 2015
Your explanation make me understand this question!.
i don't know when i will know maths ooo.


iyke2ken:



Half of a polygon is equal to the regular size of the circle. The angle marked x is equivalently attached to the total degrees in a circle which is equal to 360. When you check the obtuse angle created when the two fifty cents meet ( although I think there is just one fifty cent). X is equals to 60 degrees if you look at it head on.. But turn it to the side and x could be 30 degrees.




*deep sigh*


Honestly, I do not know the answer. I just copied that guy that said 60 degrees

1 Like

Re: Can You Solve This Math That Baffled Australian Students? by Nobody: 1:08pm On Nov 04, 2015
what's baffling here is that i don't know what to solve for. there clearly are two black lines along one coin. implying we have to solve for the angle subtended by the chord which is the side, and then there's that big, red X right in the middle of the coins, implying that we need to solve for the angle between the coins. and both answers are in the options.

anyway, to solve for the angle between two black lines, that is, if x is referring to that angle,

total angle in a circle, divided by twelve possible chords. 360/12 = 30.

to solve for the angle between the coins, angle in a straight line, minus interior angle between lines. 180 - 150 = 30.
this will give us half the angle of that point. because we had to draw a straight line, dividing that angle in two. then simply multiply by two and the angle you need is 60 degrees.

but which one are we supposed to find?!

I'm going for the one within the two black lines. seems legit.
so, the answer is 30 degrees.

**EDIT**

well, i was WRONG! guys. turns out the two black lines were a bloody distraction. that's quite annoying!
anyway, the answer is 60 . . . because . . . i don't really know, i guess the letter takes precedence over geometry in mathematics. cry cry

1 Like

Re: Can You Solve This Math That Baffled Australian Students? by rofesobi33(m): 1:09pm On Nov 04, 2015
The answer is 60 degree because if two12 sides of 'gon coin is placed together at the edge to balance.
Then, the triangle formed at the balanced edge is Equilateral triangle that has 3 sides and angles equal.
180/3 =60 degree = the agle x
Re: Can You Solve This Math That Baffled Australian Students? by ados4ejy: 1:09pm On Nov 04, 2015
oddysey:
That figure is a dodecagon (polygon with 12 sides)
With n=12, i.e. number of sides, Total angle in a dodecagon = 180 (n-2) = 180 (12-2) = 1800 degrees.
Therefore, each internal angle = 1800/12 = 150 degrees.
The triangle formed is isosceles, i.e. has 2 sides of equal length and the angles opposite those sides also equal.
So, in the triangle formed, you have the 2 angles at the base to be 75 degrees.
Since the angles in a triangle sum up to 180 degrees, X is therefore 180 - 75 -75 = 30 degrees.
I hope I am right. smiley

Naa.....thr formular 180 (n-2) is for the total sum of interior angles. The sum of exterior angles in any polygon is equal to 360 degrees.
Re: Can You Solve This Math That Baffled Australian Students? by nawtibownie: 1:09pm On Nov 04, 2015
InvertedHammer:

/
Critical thinking.
An analyst in the making
The question looks like a Board exam question where they don't expect you to whip out a calculator.
They are looking for applied knowledge.

Question: is x the angle between the coins or is it angle marked on the coin?

/

God bless you. You are the only person who seem to get my point. The X I see is in between the coins. If it was the marked area in the coin, an arc or arrow should have indicated that.

1 Like

Re: Can You Solve This Math That Baffled Australian Students? by Ndeewonu: 1:10pm On Nov 04, 2015
There is a little confusion here concerning what they mean by "X".

However, if "X" is the angle between the two polygons, then...

Simply use INTERIOR (or EXTERIOR) ANGLES OF A REGULAR POLYGON formula.

Sum of Interior Angles = (n-2) × 180°

Each Angle (of a Regular Polygon) = (n-2) × 180° / n


Then, we have a polygon with 12 sides...

Each INTERIOR angle = (12-2) x 180/12

INT angle = 10 x 180/12

= 1800/12 = 150'

Each of the two adjoining INT angles of the 12-sided polygons = 150'

Therefore, the total angles = 150' x 2 = 300'

A circle = 360'

Therefore to find the inclined angle X,

360' - 300' = 60'

Ans = 60'

1 Like

Re: Can You Solve This Math That Baffled Australian Students? by ados4ejy: 1:11pm On Nov 04, 2015
Answer is 60 degress.
Sum of exterior angles in a polygon is 360 degree. Therefore on exterior angle against a 180 plane is equal to 360 divided by 12 which is 30 degreess.

Since x is two exterior angles. x is 30 times 2 which is equal to 60 degrees.
Re: Can You Solve This Math That Baffled Australian Students? by klassd(m): 1:11pm On Nov 04, 2015
60
Re: Can You Solve This Math That Baffled Australian Students? by Baeyel: 1:11pm On Nov 04, 2015
[color=#006600][/color]
oddysey:
That figure is a dodecagon (polygon with 12 sides)
With n=12, i.e. number of sides, Total angle in a dodecagon = 180 (n-2) = 180 (12-2) = 1800 degrees.
Therefore, each internal angle = 1800/12 = 150 degrees.
The triangle formed is isosceles, i.e. has 2 sides of equal length and the angles opposite those sides also equal.
So, in the triangle formed, you have the 2 angles at the base to be 75 degrees.
Since the angles in a triangle sum up to 180 degrees, X is therefore 180 - 75 -75 = 30 degrees.
I hope I am right. smiley
. So what did u do with the internal angle you calculated.your answer is wrong. If you draw a straight line through the point of contact, you will notice that the space will divided into two equal halves. Angles on straight line sum up to 180deg. Therefore the internal angle plus the half the space will be 180deg. Implying dat half the space is 30deg. Therefore the whole space is 60deg.

1 Like

Re: Can You Solve This Math That Baffled Australian Students? by Nobody: 1:12pm On Nov 04, 2015
The answer is 30 degrees. Easy peezy!
Re: Can You Solve This Math That Baffled Australian Students? by WETINUSABI: 1:14pm On Nov 04, 2015
EverestdeBliu:
Total angles in a circle = 360 Number of sides = 12 X = 360 ÷ 12 X = 30 Therefore,angle x is equals 30 degrees.
Correct answer
Re: Can You Solve This Math That Baffled Australian Students? by Osu175(m): 1:15pm On Nov 04, 2015
Polygon
n=12
Formular for a polygon
(n-2)180
n=12
(12-2)180
10x180
1800
All angel are equel,therefor
1800/12
150
Angel on a straight line is 180, therefor
180-150=30
Half of the angel is 30 which is for one coin,so for the two coin
30x2=60
Ans is D

2 Likes

Re: Can You Solve This Math That Baffled Australian Students? by Nobody: 1:16pm On Nov 04, 2015
I take eye solve am... na issesoless* triangle
Hence 60deg... since 60 * 3 = 180 which is total angle of a triangle! undecided
Re: Can You Solve This Math That Baffled Australian Students? by babseg(m): 1:22pm On Nov 04, 2015
iyke2ken:



Half of a polygon is equal to the regular size of the circle. The angle marked x is equivalently attached to the total degrees in a circle which is equal to 360. When you check the obtuse angle created when the two fifty cents meet ( although I think there is just one fifty cent). X is equals to 60 degrees if you look at it head on.. But turn it to the side and x could be 30 degrees.




*deep sigh*


Honestly, I do not know the answer. I just copied that guy that said 60 degrees

I like your honesty wink

1 Like

Re: Can You Solve This Math That Baffled Australian Students? by satowind(m): 1:24pm On Nov 04, 2015
The answer is 30.
Re: Can You Solve This Math That Baffled Australian Students? by TruthisOut: 1:24pm On Nov 04, 2015
holocron:
This is JSS geometry.

D) 60deg. Angles in a circle = 360. Since there are 12 chords, angle at the inside of each chord triangle is 30, the sides of the chords 75 each (angle inside triangle = 180). Including the ones on the other coin = 75×4 = 300. So x is 60. (Angle round a circle is 360deg)

The answer is 60deg. But your explanation is confusing. This is the angle between the coins.

1 Like

Re: Can You Solve This Math That Baffled Australian Students? by femi4: 1:24pm On Nov 04, 2015
ureach:
I take eye solve am... na issesoless equilateral* triangle
Hence 60deg... since 60 * 3 = 180 which is total angle of a triangle! undecided

1 Like

Re: Can You Solve This Math That Baffled Australian Students? by scarr: 1:24pm On Nov 04, 2015
holocron:
This is JSS geometry.

D) 60deg. Angles in a circle = 360. Since there are 12 chords, angle at the inside of each chord triangle is 30, the sides of the chords 75 each (angle inside triangle = 180). Including the ones on the other coin = 75×4 = 300. So x is 60. (Angle round a circle is 360deg)

Hehehe, if angle X is 60 and total and total angles of a Circle is 360......dont u think it doesnt add up.

60x12 is 720 o bros.....
even mere looking at it, its not up to 45
Re: Can You Solve This Math That Baffled Australian Students? by ptolemy247(m): 1:25pm On Nov 04, 2015
holocron:
This is JSS geometry.

D) 60deg. Angles in a circle = 360. Since there are 12 chords, angle at the inside of each chord triangle is 30, the sides of the chords 75 each (angle inside triangle = 180). Including the ones on the other coin = 75×4 = 300. So x is 60. (Angle round a circle is 360deg)

You got the answer but you missed the method
The number of angles in a 12-sided polygon is (n-2)*180~(12-2)*180=1800.
When you divide 1800 by 12, you have 150 equal interior angles.
However, a theory states that the sum of the interior angle and the opposite exterior angle is equal to 180. So 180-150=30
For both polygons, you have 30*2=60 Q.E.D
Re: Can You Solve This Math That Baffled Australian Students? by Nobody: 1:26pm On Nov 04, 2015
InvertedHammer:

/
Scientific thinking.

An engineer in the making.

Question: is x the angle between the coins or the angle marked on the left coin?
/
Exactly! Everyone got the question wrong. X is not the angle in the coin. X is that angle between the two coins.

In that case, it's quite tasking.
Re: Can You Solve This Math That Baffled Australian Students? by Kockane(m): 1:26pm On Nov 04, 2015
Demmocrats:


It seems you didn't study elementary maths the dude is so correct

X = 60degree

Please don't vex me this afternoon. I had A1 in my waec and still minored in maths and statistics back in Uni. What is your pedigree in the math world?? angry The other coin is just a distraction. Look again or explain to me how you arrived at your 60 degrees.
Re: Can You Solve This Math That Baffled Australian Students? by babseg(m): 1:27pm On Nov 04, 2015
Obrizzy:
I believe it's 30'

i like your faith

1 Like

Re: Can You Solve This Math That Baffled Australian Students? by scarr: 1:28pm On Nov 04, 2015
Kockane:


Please don't vex me this afternoon. I had A1 in my waec and still minored in maths and statistics back in Uni. What is your pedigree in the math world?? angry The other coin is just a distraction. Look again or explain to me how you arrived at your 60 degrees.

like i dont even get where they are seeing 60, even a right angle of 45 is clearly bigger than that angle up there
Re: Can You Solve This Math That Baffled Australian Students? by babseg(m): 1:29pm On Nov 04, 2015
oddysey:
That figure is a dodecagon (polygon with 12 sides)
With n=12, i.e. number of sides, Total angle in a dodecagon = 180 (n-2) = 180 (12-2) = 1800 degrees.
Therefore, each internal angle = 1800/12 = 150 degrees.
The triangle formed is isosceles, i.e. has 2 sides of equal length and the angles opposite those sides also equal.
So, in the triangle formed, you have the 2 angles at the base to be 75 degrees.
Since the angles in a triangle sum up to 180 degrees, X is therefore 180 - 75 -75 = 30 degrees.
I hope I am right. smiley

wrong

with all your dodecagon grin

2 Likes

Re: Can You Solve This Math That Baffled Australian Students? by Kockane(m): 1:31pm On Nov 04, 2015
scarr:


like i dont even get where they are seeing 60, even a right angle of 45 is clearly bigger than that angle up there

I wish we were still in school and this was continuous assessment and the teacher says those that fail this question will stay behind after school hours for extra mural classes. I go laff them ehn! cheesy

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