Question

What is the surface area of a cylinder with a diameter of 8 centimeters and a height of 12 centimeters?

A. 1,005.71cm
B. 401.92cm
C. 704cm
D. 352cm

Answer 1

The formula for this is
`A=2 \pi rh+2 \pi r^(2)`. If the diameter is 8 the radius is 4, so filling in accordingly we have
`A=2 \pi (4)(12)+2 \pi (16)` and
`A=96 \pi +32 \pi` which is
`A=128 \pi` and when you multiply in 3.14 you get that A = 401.92 or B above.