SOLUTION: A cylinder has a diameter of 10 inches and a height four times its radius. What is its volume?

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Question 302152: A cylinder has a diameter of 10 inches and a height four times its radius. What is its volume?
Answer by london maths tutor(243) About Me  (Show Source):
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Volume of a cylinder = cross-sectional area x height
cross sectional area = pi*r^2
Diameter = 10 inches
radius = 10/2 = 5 inches
cross sectional area = pi(5^2) = (25*pi) inches^2
Height = 4r = 4*5 = 20 inches
Volume = (25*pi*20) inches^3
Volume = 1570.8 inches^3