- Submitted By: april_huff67
- Date Submitted: 11/24/2015 1:44 PM
- Category: Technology
- Words: 553
- Page: 3

CHAPTER

9

Geometry

9.1 Perimeter

9.2 Area

9.3 Circles

9.4 Volume

9.5 Angles and Triangles

9.6 Square Roots and the Pythagorean Theorem

Copyright 2011 Pearson Education, Inc.

Slide 2

9.1

Perimeter

OBJECTIVES

a Find the perimeter of a polygon.

b Solve applied problems involving perimeter.

Copyright 2011 Pearson Education, Inc.

Slide 3

9.1

Perimeter

Perimeter of a Polygon

A polygon is a closed geometric figure with three or

more sides. The perimeter of a polygon is the

distance around it, or the sum of the lengths of its

sides.

Copyright 2011 Pearson Education, Inc.

Slide 4

9.1

Perimeter

a Find the perimeter of a polygon.

EXAMPLE A Find the perimeter of this polygon.

9m

Solution

5m

4m

Add the lengths of all sides.

8m

Perimeter = 5 m + 4 m + 6 m + 8 m + 9 m

= (5 + 4 + 6 + 8 + 9) m

= 32 m

Copyright 2011 Pearson Education, Inc.

6m

Slide 5

9.1

Perimeter

Perimeter of a Rectangle

A rectangle is a polygon with four sides and four 90

degree angles.

The perimeter of a rectangle is twice the sum of

the length and the width, or 2 times the length plus

2 times the width.

l

P = 2l + 2w, or P = 2 (l + w).

w

w

l

Copyright 2011 Pearson Education, Inc.

Slide 6

9.1

Perimeter

a Find the perimeter of a polygon.

EXAMPLE B Find the perimeter of a barn door that is 10

f by 12 f.

Solution

P = 2l + 2w

= 212 f + 210 f

= (212) f + (210) f

= 24 f + 20 f

= 44 f

Copyright 2011 Pearson Education, Inc.

Slide 7

9.1

Perimeter

Perimeter of a Square

A square is a rectangle in which all sides have the

same length.

The perimeter of a square is four times the length

s

of a side.

P = 4s

s

s

s

Copyright 2011 Pearson Education, Inc.

Slide 8

9.1

Perimeter

a Find the perimeter of a polygon.

EXAMPLE C Find the perimeter of a square garden with

sides of length 15 feet.

Solution

P = 4s

= 4 ∙ 15 f

= 60 f

Copyright 2011 Pearson...

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