Question

A net of a rectangular prism is shown.

A net of a rectangular prism with dimensions 4 and one-half centimeters by 3 centimeters by 8 and one-half centimeters.

What is the surface area of the prism?
77.25 cm2
154.5 cm2
225 cm2
309 cm2

Answer 1

Surface area = 2(lw + lh + wh) with l = 4.5, w = 3, h = 8.5.

lw = 4.5×3 = 13.5
lh = 4.5×8.5 = 38.25
wh = 3×8.5 = 25.5

Sum = 13.5 + 38.25 + 25.5 = 77.25
Surface area = 2×77.25 = 154.5 cm²

Answer: 154.5 cm².