DIRECTIONS: In questions no. 96 to 100, you have a brief The base of a right pyramid is an equilateral triangle of side 10 3 cm. If the total surface area of the pyramid is 270 3 sq. cm, its height is

Explanation

(DABC) + ar (DBDC) T.S.A of pyramid = 1 1 ´ ´ + ´ ´ \ BD AE DC AF 2 2 1 3 2 + ´ ´ + ´ BC AG ( side ) 2 4 2013 Solved Paper l = 18 cm, b = 12 cm, h = 3 cm S = 2(lh + bh) + lb {Box is open from upper side} = 2 (54 + 36) + 216 = 396 cm2 (16)2 + (12)2 = 400 = (20)2