Find the area of a regular polygon

1
Find the area of a regular polygon
EXAMPLE 2
DECORATING
SOLUTION
STEP 1
Find the perimeter P of the table top. An
octagon has 8 sides, so P 8(15) 120 inches.
2
Find the area of a regular polygon
EXAMPLE 2
STEP 2
To find RS, use the Pythagorean Theorem for ?
RQS.
3
Find the area of a regular polygon
EXAMPLE 2
STEP 3
Find the area A of the table top.
Formula for area of regular polygon
Substitute.
1086.5
Simplify.
4
Find the perimeter and area of a regular polygon
EXAMPLE 3
5
Find the perimeter and area of a regular polygon
EXAMPLE 3
6
Find the perimeter and area of a regular polygon
EXAMPLE 3
7
for Examples 2 and 3
GUIDED PRACTICE
Find the perimeter and the area of the regular
polygon.
8
for Examples 2 and 3
GUIDED PRACTICE
Find the perimeter and the area of the regular
polygon.
9
for Examples 2 and 3
GUIDED PRACTICE
Find the perimeter and the area of the regular
polygon.
10
for Examples 2 and 3
GUIDED PRACTICE
6. Which of Exercises 35 above can be solved
using special right triangles?