20 A square pyramid measuring 9 yd along the base with a sla

20) A square pyramid measuring 9 yd along the base with a slant height of 12.8 yd.

Solution

The Surface area of a Pyramid = (1/3) * Perimeter of base * Slant Height

Perimeter of base = 9*4 = 36

Therefore SA = (1/3) * 36 * 12.8 = 153.6 yd².