Question

a right circular cylinder has a height of 10 in. and a radius two-fifths its height. the exact surface area of the cylinder is ___ pi in^2

Answer 1

Surface area of a cylinder: 2 π r h + 2πr^2

Where:

r = radius = 2/5 x 10 = 4

h = height = 10

Replacing:

SA = 2 π (4) 10 + 2π(4)^2 = 80 π + 32 π = 112 π