Write an equation for the surface area of both triangular bases of the net.

Surface area of both triangular bases = 2 * (Area of base triangle)

Area of base triangle = (1/2) * base * height

Given:
Base = 5 ft
Height = 5 ft

Area of base triangle = (1/2) * 5 ft * 5 ft = 12.5 ft^2

Therefore, Surface area of both triangular bases = 2 * 12.5 ft^2 = 25 ft^2