Question

Find the surface area of the prism.
5 cm
3 cm
7 cm

Answer 1

A=2(wl+hl+hw)

A= 2 (3×7+7×5+5×3)

A=2×71

A=142

Answer 2

A prism has 6 sides.

2 sides are 7 x 5

2 are 3 x 5

2 are 3 x7

Surface area = 2(7x5) + 2(3x5) + 2(3x7)

Surface area = 70 + 30 +42

Surface area = 142 square cm