Start with the bottom, which is a 5 by 5 square, and you get 25ft^2 or square feet Then the four sides. The area for a triangle is 1/2 base*height. 5*8 is 40/2=20 There are four of these sides so 20*4=80. Add this to the bottom and you get 80+25=105 square units
I think you mean pyramids so surface area there are triangles on the faces of the pyramids so 1/2BH=SA of 1 of the side so for the whole side surface are of each side=BH B=5 H=8 (5)(8)(1/2)=20 4 sides (4)(20)=80= top surface area
the surface are of the base (5)(5) =25 25+80=105 sq units