Answer:
Surface area =
160 sq cm
Step-by-step explanation:
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.
A = 1/2•8•11
= 44 sq cm
One face is 44, 3×44 is 132 for all three faces.
Surface area =
28 + 132
= 160 sq cm
