maths
posted by Anonymous ii .
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?

volume of cylinder = πr^2 h
radius = 10 inches
= 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 
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