1.

Diameter of the base of a cone is 10.5 cm and its slant height is 10 cm. Find its curved surface area.

Answer»

Diameter of the base of a cone, d = 10.5 cm. 

height h = 10 cm. 

Curved Surface Area, C.S.A. = ? 

d = 10.5 cm, = 10\(\frac{1}{2} = \frac{21}{2}\)cm. 

h = l = 10 cm. 

∴ Curved Surface Area of a cone = πrl



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