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 un2
+252 
