The surface area of a regular pyramid with a square base which has a slant height of 5 units and base side lengths of 9 units is:
A) 360 units squared
B) 252 units squared.
C) 171 units squared.
D) 117 units squared.
Atotal = Abase + 4 • Aone side
A = (9)(9) + 4 • (4.5)(5)
A = 81 + 90
A = 171 units2
.
+252 
