# maths

A storage tank is in the shape of a right circular cylinder that has a diameter of 20 inches and a height of 3yards. if oil costs \$2 per cubic foot, what does it cost to fill the storage tank oil?

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1. volume of cylinder = πr^2 h

= 10/12 or 5/6 ft
height = 3 yards = 9 ft

vol = π(25/36)(6) = (25/6)π cubic ft.

cost = \$2(25/6)π = \$25π/3 or \$26.18

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2. a circle has a circumference of about 16.3 meters and a diameter of about 5.2 meters what is the relationship between the circumference and diameter of this cricle

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