The lateral area of a right cylinder having a base diameter of 10 units and a height of 10 units is:

A) 78.5 units squared.

B) 157 units squared.

C) 235.5 units squared.

D) 314 units squared.

lateral area of cylinder = circumference of base * height

circumference of base = pi * diameter = pi * 10 = 10pi

Plug in 10pi for the circumference of base and 10 for height.

lateral area of cylinder = 10pi * 10 = 100pi ≈ 314 un^{2}