Answer:
136 in^2
Step-by-step explanation:
In order to find the surface area of a shape there are a few things you have to know. First is how to find the surface area of a triangle, and the formula for that is L + 2B, or length + (2 x Base) so for this problem it would be 12 + (10 x 2), which equals 32. Next we double the answer for both sides of the triangle which gives us 64. The second step is to find the area of the rectangles. The two on the sides are 13 x 2, which equals 26, double it for 52. Thirdly you need to find the area of the bottom triangle, which would be 10 x 2 = 20. Finally you need to add them all up. 64 + 52 + 20 = 136
