How do you find a triangle prism and find the surface area? The square has 9 and the triangles are 12.
+130516 You must mean "pyramid" rather than prism......and I'm assuming a square pyramid with a a base side = 9
And I assume that 12 is the height of each triangle
The total surface area = surface area of the base + surface area of the sides =
[side of base]^2 + 4 * (area of each triangle) =
[side of base]^2 + 4 (1/2)(side of base)(height of triangle)
(9)^2 + 4(1/2)(9)(12) =
36 + 18*12 =
36 + 216 =
252 units^2
