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xVenom32
you have the area of the squares
100 in^2 
area of a square = l*w
so length and width of the square both equal 10in
there are 4 squares going across the semi circle so...
diameter of semicircle is 10+10+10+10 =40in and radius is 20in
to find area of semicircle the formula is 1/2 pi r^2
so plug in the numbers 1/2(3.14) (20)^2 = 628 in ^2
now add that to area of big square part of window 
40 inches length * 40 inches width = 1600in^2 (or you can just add them all up ) 
add up the areas now 1600+628= 2228 in^2
i think that is right
a) We know that the radius of the top of the window is two side lengths of a square. Since each square has a side length of 10 inches, the radius of the half-circle portion is 20 inches. The area of a half-circle is (pi*r²)/2 (r being radius and pi being 3.14). There are 16 squares as well. So the equation is ((3.14*20²)/2) + (16*100)=2,228 in²
b) The next part's a little tricky, but just add 4 inches to the radius and 4 inches to all of the affected outer-rim squares. You should get 3016.32 in²