Geometry 4-12 Day 1

Do NowDo Now

Name any common ratios/proportions Name any common ratios/proportions that you see in this figure. that you see in this figure.

4-1-09

A

B

D

C

E

20

15

60

45

10

17.5

ObjectiveObjective

We will explore another proportion found We will explore another proportion found with the side splitter theorem. with the side splitter theorem.

4-1-09

Note Book QuizNote Book Quiz

Do Now Questions fromDo Now Questions from 3-24-093-24-09 3-25-093-25-09

Objectives FromObjectives From 3-30-093-30-09 4-1-094-1-09

Answers for the Do NowAnswers for the Do Now 3-24-093-24-09

4-1-09

HomeworkHomework

Page 312 #9 a – cPage 312 #9 a – c

c.c. 1212

d.d. 2828

e.e. 2525

Theorem 4.1 says “If the segment is Theorem 4.1 says “If the segment is parallel with the third side it splits them parallel with the third side it splits them proportionally”proportionally”

This means that This means that AD AE

DB EC=

A

B

D

C

E

How to prove it…How to prove it…

Page 313 in the BookPage 313 in the Book

Using this fact!Using this fact!

A

B

D

C

E

45

15 7

HomeworkHomework

Pg 318 #1-3Pg 318 #1-3