If the volume of a right circular cylinder is 9πh m³,

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If the volume of a right circular cylinder is 9πh m³, where h is its height (in metres) then the diameter of the base of the cylinder is equal to

Let the radius of base be r metres.
∴ πr²h = 9πh
⇒ r⊃2 = 9
⇒ r = 3 m
∴ Diameter = 2 × 3 = 6 metres.