Chapter 8.3, Problem 19E

### Elementary Geometry For College St...

7th Edition
Alexander + 2 others
ISBN: 9781337614085

Chapter
Section

### Elementary Geometry For College St...

7th Edition
Alexander + 2 others
ISBN: 9781337614085
Textbook Problem

# In Exercises 17 to 30, use the formula A = 1 2 a P to find the area of the regular polygon described.Find the area of a regular octagon with an apothem of length a = 9.8 in. and each side of length s = 8.1 in.

To determine

To find:

The area of a regular octagon.

Explanation

1) The perimeter of a regular polygon is given by P = ns, where n is the number of sides and s is the length of any side.

2) The area of a regular octagon with apothem a and perimeter P is given by A=12(aP).

Calculation:

It is given that the apothem and length of the regular octagon are 9.8 in and 8.1 in respectively.

The total number of sides in a regular octagon is 8.

Use the formula for the perimeter of regular polygon, i.e., perimeter = ns

Substitute n = 8 and s = 8.1 in P = ns.

P = (8)(8.1)

= 64.8 in

Use the formula of area of regular octagon, A=12(aP)

Substitute a = 9

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