The whole surface area of a pyramid whose base is a regular polygon is 340 cm2 and area of its base is 100 cm2. Area of each lateral face is 30 cm2. Then the number of lateral faces is:

The whole surface area of a pyramid whose base is a regular polygon is

1.	The whole surface area of a pyramid whose base is a regular polygon is 340 cm2 and area of its base is 100 cm2. Area of each lateral face is 30 cm2. Then the number of lateral faces is:
A.	8
B.	9
C.	7
D.	10
Answer» B. 9