104 pi ~ 326.7256
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the equation for area of a triangle is A = 1/2 bhso the answer is . . . 1/2 x 13 x 16 = 104
Oh, what a lovely combination of shapes you have there! Let's start by finding the area of the semicircle, which is half the area of a full circle. Then, we can calculate the area of the trapezoid using its height and the average of its bases. Finally, we add these two areas together to find the total area of your beautiful figure. Remember, there are no mistakes, just happy little accidents in math!
Surface area of rectangular prism: 2(25)+4(30) = 170 square inches
A polygon that has 104 diagonals will have 16 sides
104