1. Surface Area of Pyramids

2. Vocabulary
Pyramid: a 3D figure with one polygonal base and triangular sides that come to a point

3. Square Pyramid – 1 square base and 4 congruent triangular sides
Find area of square base
Area of square = s2 or bh = 25 * 25 = 625 ft2
Find area of one triangular side
Area of triangle = ½ bh = ½ * 25 * 32 = 400 ft2
Multiply the triangular area by 4 since there are four congruent triangular sides
400ft2 * 4 = 1600 ft2
Add the two areas together to get total surface area
625 ft ft2 = 2225 ft2
32 feet
25 feet
25 feet

4. Practice