Warm-up

4

Find the perimeter and area of both shapes, then double andtriple the dimensions. What happens?

4

4

Agenda

Missing Work Begin Chapter 7 Homework

Given: Points A, B and C are on line l Point P is not on l

PB < PC

Prove: mPCB 90

P

A B C

1.

2.

3.

4.

l

5-5 Triangle Inequalities

If two sides of a triangle are 5 and 12 what are the possible values for the size of the third side?

Book Work

Page 772

Lesson 5-1 #1, 5, 7

Lesson 5-2 #3, 5

Page 773

Lesson 5-3 #2, 6

Lesson 5-4 #2, 4

Page 773

Lesson 5-5 #4, 6, 8

Page 774

Lesson 5-6 #2, 6

7-1 Proportions

8:18

1

Ratio – a comparison of two numbers using division

Proportion – an equation of the form a/b = c/d that states thattwo ratios are equivalent

150

336

100

224

Cross Product – 224(150) = 100(336) extreme

means

b, d can not equal zero

Example

Answers Ahead

7-1 Study Guide

7-1 Study Guide

7-1 Practice

7-1 Practice

7-1 Practice

7-2 Exploring Similar Polygons

Example Polygon RSTUV is similar to polygon ABCDE

The ratio of lengths of corresponding sides of similar polygons is called theScale Factor. The scale factor of RSTUV to ABCDE is 18:4. The scalefactor of ABCDE to RSTUV is 4:18. How else could these scale factors bestated? What are the values for x and y?

Example Triangle ABC has

vertices A(0, 0), B(4, 0), and C(2, 4). If the coordinates of each vertex are multiplied by 2, will the new figure be similar to the original?

Answers Ahead

7-2 Study Guide

7-2 Study Guide

7-2 Study Guide

7-2 Practice

7-2 Practice

Homework

7-1 Multicultural Activity 7-2 Study Guide & Practice