To find surface area, you find the area of all the faces and add them together. There are 4 faces (flat surfaces) The base is a triangle and the 3 sides are also triangles. The area of a triangle is:
A = 1/2 b•h
For the base,
A = 1/2•8•7
A = 28 sq cm
For the sides, we can do one calculation and times by 3 because they are all the same.
