The tent has a base with equal sizes of 3 yards. The lateral area, which is the sum of all faces of each triangle has a lateral side of 6 yards. Thus, each lateral side must be 6 yards. Then, we find its area through the Heron's formula using the semiperimeter (s).
s = (6+6+60/2 = 9
A = √[9(9-6)(9-6)(9-6)]
A = 15.6 square yards
The answer is A.
