The diameter of the base of a cone is 42 cm and its volume is 12936 cm3. Its height is
Given: Diameter of the base of a cone is 42 cm.
Volume of the cone is 12936 cm3.
Volume of the cone is given by: 
× π × r2 × h
∴ 
× π × r2 × h = 12936
⇒ 
× π × (
)2 × h = 12936 (here diameter = 42cm, ∴ r = 
= 21)
⇒ 
× π × (21)2 × h = 12936
⇒ h = 
= 28cm
∴ Height of the given cone is 28cm
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