Volume 15Q

15. The slant height of a right circular cone is 10 m and its height is 8 m. Find the area of its curved surface.

     A.   30∏ m2

     B.   40∏ m2

     C.   60∏ m2

     D.   80∏ m2

Answer:

Option : C 

l = 10 m

h = 8 m

So, r = l² - r² = 10² - 8² = 6 m

∴ Curved surface area = ∏rl = ( ∏ x 6 x 10) m² = 60∏ m²