A right prism has a rectangular base of dimensions 6.5 cm by 4.2 cm, and its height is 12 cm. Calculate the total surface area of the prism.
Show answer & explanation
Correct answer: B
Explanation
Given:
Length = 6.5 cm
Width = 4.2 cm
Height = 12 cm
According to the formula:
Total Surface Area = 2(lb + bh + hl)
lb = 6.5 × 4.2 = 27.3
bh = 4.2 × 12 = 50.4
hl = 6.5 × 12 = 78
lb + bh + hl = 27.3 + 50.4 + 78 = 155.7
Total Surface Area = 2 × 155.7 = 311.4 cm²