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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 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: Correct Answer 8

Total surface area = Lateral surface area + Area of Base

340 = Lateral surface area + 100

Lateral surface area = 340 – 100 = 240 cm2

Area of each lateral face = 30 cm2

Number of lateral faces = 240/30 = 8

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