Find the curved surface area, if the radius of a cone is 21 m and slant height is 15 m?  Select:
A) 660 B) 770 C) 880 D) 900 E) 990
Cone curved surface area = Ï€rl   22/7 Ã— 21 Ã— 15 = 66 Ã— 15 = 990 m(power2)   Answer is 990.
<result>E</result>
Find the curved surface area, if the radius of a cone is 21 m and slant height is 15 m?