This document discusses using similar triangles to solve problems involving proportions. It begins with examples of identifying similar triangles in diagrams and writing proportions between corresponding sides. It then shows how to use proportions to find unknown side lengths. One example finds the maximum depth of a swimming pool using similar right triangles formed by the pool diagram. Another finds the value of y in a right triangle given side lengths using a proportion of corresponding hypotenuses and shorter legs. The document concludes with an example using similar triangles to approximate the height of a gym wall.
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324 Chapter 5 Relationships Within TrianglesObjective To.docxgilbertkpeters11344
324 Chapter 5 Relationships Within Triangles
Objective To use inequalities involving angles and sides of triangles
In the Solve It, you explored triangles formed by various lengths of board. You may have
noticed that changing the angle formed by two sides of the sandbox changes the length
of the third side.
Essential Understanding Th e angles and sides of a triangle have special
relationships that involve inequalities.
Property Comparison Property of Inequality
If a 5 b 1 c and c . 0, then a . b.
For a neighborhood improvement project, you
volunteer to help build a new sandbox at
the town playground. You have two boards
that will make up two sides of the
triangular sandbox. One is 5 ft long and the
other is 8 ft long. Boards come in the
lengths shown. Which boards can you use
for the third side of the sandbox? Explain.
Inequalities in
One Triangle
5-6
t
t
tt
o
lele
f
Think about
whether the shape
of the triangle
would be easy to
play in.
Dynamic Activity
Triangle
Inequalities
T
A
C T I V I T I
E S T
AAAAAAAA
C
A
CC
I E
SSSSSSSS
DY
NAMIC
Proof of the Comparison Property of Inequality
Given: a 5 b 1 c, c . 0
Prove: a . b
Statements Reasons
1) c . 0 1) Given
2) b 1 c . b 1 0 2) Addition Property of Inequality
3) b 1 c . b 3) Identity Property of Addition
4) a 5 b 1 c 4) Given
5) a . b 5) Substitution
Proof
hsm11gmse_NA_0506.indd 324 3/6/09 11:56:15 AM
http://media.pearsoncmg.com/aw/aw_mml_shared_1/copyright.html
Problem 1
Got It?
Lesson 5-6 Inequalities in One Triangle 325
Th e Comparison Property of Inequality allows you to prove the following corollary to
the Triangle Exterior Angle Th eorem (Th eorem 3-11).
Proof of the Corollary
Given: /1 is an exterior angle of the triangle.
Prove: m/1 . m/2 and m/1 . m/3.
Proof: By the Triangle Exterior Angle Th eorem, m/1 5 m/2 1 m/3. Since
m/2 . 0 and m/3 . 0, you can apply the Comparison Property of
Inequality and conclude that m/1 . m/2 and m/1 . m/3.
Applying the Corollary
Use the fi gure at the right. Why is ml2 S ml3?
In nACD, CB > CD, so by the Isosceles Triangle Th eorem,
m/1 5 m/2. /1 is an exterior angle of nABD, so by the
Corollary to the Triangle Exterior Angle Th eorem, m/1 . m/3.
Th en m/2 . m/3 by substitution.
1. Why is m/5 . m/C?
You can use the corollary to Th eorem 3-11 to prove the following theorem.
Corollary Corollary to the Triangle Exterior Angle Theorem
Corollary
Th e measure of an exterior
angle of a triangle is greater
than the measure of each of
its remote interior angles.
If . . .
/1 is an exterior angle
Then . . .
m/1 . m/2 and
m/1 . m/3
2 1
3
Proof
3
4
1
25
A
CD
B
Theorem 5-10
Theorem
If two sides of a triangle are
not congruent, then the
larger angle lies opposite
the longer side.
If . . .
XZ . XY
Then . . .
m/Y . m/Z
You will prove Theorem 5-10 in Exercise 40.
X
Y
Z
G
U
I
m
C
Th
G
How do you identify
an exterior angle?
An exterior angle
must be form.
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7.3 use similar right triangles
1. 7.3 Use Similar Right Triangles
7.3
Bell Thinger
1. Are these triangles similar? If so, give the reason.
ANSWER
2. Find x.
Yes; the AA Similarity Postulate
ANSWER
50
3. Example 1
7.3
Identify the similar triangles in the diagram.
SOLUTION
Sketch the three similar right triangles so that the
corresponding angles and sides have the same orientation.
TSU ~
RTU ~
RST
4. Example 2
7.3
Swimming Pool The diagram below shows a crosssection of a swimming pool. What is the maximum
depth of the pool?
5. Example 2
7.3
SOLUTION
STEP 1 Identify the similar triangles and sketch them.
RST ~ RTM ~ TSM
STEP 2
Find the value of h. Use the fact that RST ~
RTM
to write a proportion.
Corresponding side lengths of
TM TR
=
similar triangles are in proportion.
ST
SR
h
152
=
Substitute.
64
165
165h = 64(152)
h ≈ 59
Cross Products Property
Solve for h.
6. Example 2
7.3
STEP 3
Read the diagram. You can see that the maximum
depth of the pool is h + 48, which is about 59 + 48 = 107
inches.
The maximum depth of the pool is about 107 inches.
7. Guided Practice
7.3
Identify the similar triangles. Then find the value of x.
1.
ANSWER
EGF ~
GHF ~
LMJ ~
MKJ ~
EHG ;
12
5
2.
ANSWER
LKM ;
60
13
8. Example 3
7.3
Find the value of y. Write your
answer in simplest radical form.
SOLUTION
STEP 1
Draw the three similar triangles.
9. Example 3
7.3
STEP 2
Write a proportion.
length of hyp. of
length of hyp. of
RPQ length of shorter leg of
=
RQS length of shorter leg of
9
y
y
= 3
RPQ
RQS
Substitute.
27 = y2
Cross Products Property
27 = y
Take the positive square
root of each side.
3 3=y
Simplify.
11. Example 4
7.3
Rock Climbing Wall
To find the cost of installing a
rock wall in your school
gymnasium, you need to find
the height of the gym wall.
You use a cardboard square to
line up the top and bottom of
the gym wall. Your friend
measures the vertical distance
from the ground to your eye
and the distance from you to
the gym wall. Approximate the
height of the gym wall.
12. Example 4
7.3
SOLUTION
By Theorem 7.6, you know that 8.5 is the geometric
mean of w and 5.
w
8.5
8.5 = 5
w ≈ 14.5
Write a proportion.
Solve for w.
So, the height of the wall is 5 + w ≈ 5 + 14.5 = 19.5 feet.
13. Guided Practice
7.3
3.
Mary is 5.5 feet tall. How far from the wall in
Example 4 would she have to stand in order to
measure its height?
ANSWER
about 8.93 ft