The slant height of a cone is 21 cm and radius of the base is 10 cm, find the curved surface of the cone.	Select the correct option
A) 330 B) 770 C) 660 D) 100 E) 600
π * 21* 10= 660   Answer:660
<result>C</result>
The slant height of a cone is 21 cm and radius of the base is 10 cm, find the curved surface of the cone.