Fell free, to ask your questions on were is not clear and were in my solution you don't agree with.

Martinez19:
I cross-checked and I got 19.28882484 units².

Can you please upload your working let's see how plausible it is

ifada123:
@Akious2k2 @Martinez39 @israeliionel @etrange @Vendee @everyone
From basic solution

You did a good job but I noticed a slight mistake...
Check this,
Your area of triangle should be (half base x height) = (1/2 × 4) × sq. root of (16 - 4) = 2 × Sq root of 12 = 4 surd 3 units sq
Area of one sector = (60 / 360) pi 4 sq = 1/6 pi 4 sq
Area of the two sectors put together is therefore, 1/3 pi 4 sq
Answer is therefore,
Area of square - (4 surd 3) - (1/3 pi 4 sq)

You did a good job

Akious2k2:

You did a good job but I noticed a slight mistake...
Check this,
Your area of triangle should be (half base x height) = (1/2 × 4) × sq. root of (16 - 4) = 2 × Sq root of 12 = 4 surd 3 units sq
Area of one sector = (60 / 360) pi 4 sq = 1/6 pi 4 sq
Area of the two sectors put together is therefore, 1/3 pi 4 sq
Answer is therefore,
Area of square - (4 surd 3) - (1/3 pi 4 sq)

You did a good job

Each sector is 30 degree combined to form the 60 I used l. That was why I did not multiply again thus my answer is correct sir. Check the work again sir.

i used heros formula, (4+4+4)/2=6, squeroot(6(2x2x2)=4root3, yes i see error here, thanks