Question

The volume of a cylinder is 289 cm2 and the height is 21 cm. Find the diameter. Round the answer to the nearest whole number.
A. 2 cm
B. 3 cm
C. 6 cm
D. 4 cm

Answer 1

(pi)r^2h
289cm2 = pi * r^2 * 21
Divide out pi and 21 to get r^2. Take the square roots of both sides. multiply r by 2 to get the diameter.

Answer 2

I really don't understand that...

Answer 3

The formula for the volume of a cylinder is pi (3.14) times r squared times height
pi radius^2 height

D should be right.