Question

Kendra found the surface area of the prism below. She started by finding the surface area of the triangle and did 16*12 to get 192. Then she multiplied that by 2 and got 384.

Next she found the areas of the rectangles by doing 10*20 = 200, 12*10 = 120, and 16*10 = 160.

Finally, she added all the area together and got 672cm squared.



Where did Kendra make her mistake?

Answer 1

step 1

Explanation:

She didn't divide the 192 by 2 to get the surface area of one triangle