Q6 of 67 Page 193

The curved surface area of a cone is 1884.4 m2 and its slant height is 12 m. On the basis of this information, calculate the radius of the cone.

Curved surface area of cone = 1884.4 m2


Slant height = l = 12 m


Let r be the radius of base of cone


Curved surface area of cone = πrl


⇒ 1884.4 = × r × 12


⇒ 1884.4 = × r × 12


⇒ r =


⇒ r =


⇒ r = 49.96 ~ 50 m


Therefore, radius of base of cone is 50 m


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