2016­1­4 similar triangles by sides.notebook
January 04, 2016
Today is Mon
1/4
Do Now:
­Take calc
­Tonight's HW: Similarity #1
­If you were absent before break, you need to make up a quiz!
Warm up
Are the following
proportional?
5
1
=
10
2
2 = 3 = 10
3
6
30
Solve the
proportion
x
= 2
12
3
2016­1­4 similar triangles by sides.notebook
January 04, 2016
Module 3: Similarity
Lesson 1: Determine if Triangles are
Similar (Method 1: Proportional Sides)
Similar Triangles: Corresponding Sides are
Proportional
Corresponding
Angles congruent
2016­1­4 similar triangles by sides.notebook
January 04, 2016
B'
B
3
A
C
5
8
6
4
A'
10
C'
~
The symbol for similarity is Proving Triangles are Similar
See if sides lengths are proportional
A D
3
F
5
4
15
9
E
C
=
12
=
B
2016­1­4 similar triangles by sides.notebook
January 04, 2016
Explain whether RST and UVW are similar
U
R
5
3
4
S 20
12
T
V
W
16
Find the missing side of the similar triangle
B'
B
10
A
x
5
C
Set up a proportion
A'
6
C'
2016­1­4 similar triangles by sides.notebook
January 04, 2016
Finding missing measures in similar triangles
ABC ~ ADE
B
Find x
D
x ft
8 ft
C
14 ft
E
7 ft
A
2016­1­4 similar triangles by sides.notebook
January 04, 2016