If the diameter of the base of cone is 10 cm.

If the diameter of the base of cone is 10 cm and its height is 12 cm, then its curved surface area is
(a) 60π cm²
(b) 65π cm²
(c) 90π cm²
(d) 120π cm²

Solution:

Diameter of the base of a cone = 10 cm
Radius (r) = = 5 cm
and height (h) = 12 cm

If the diameter of the base of a cone is 12 cm and height is 20 cm, then its volume is ,
(a) 240π cm³
(b) 480π cm³
(c) 720π cm³
(d) 960π cm³

Solution:

Diameter of the base of a cone = 12 cm
Radius (r) = = 6 cm
and height (h) = 20 cm

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