The total surface atrea of a right pyramid, with base as a square of side 8cm, is 208ccm2. What is the slant height (in cm) of the pyramid?
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. 9
Total surface area = Lateral surface area + Area of the base
208 = L.S.A. + 82
⇒ 208 - 64 = L.S.A
⇒ 144 = L.S.A.
Again,
L.S.A. = 1/2 × perimeter of base × slant height
144 = 1/2 × 4 × 8 × slant height
⇒ 9 = slant height