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 ?
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. 8
Let the no. of lateral faces = n
Now, whole surface area of pyramid = base area + n lateral surface area
340 = n × 30 + 100
n = 8