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UNIT 1 • SIMILARITY, CONGRUENCE, AND PROOFS
Lesson 9: Proving Theorems About Triangles
Instruction
Prerequisite Skills
This lesson requires the use of the following skills:
•

classifying triangles

•

i dentifying and using vertical angles, supplementary angles, and complementary angles to
find unknown angle measures

•

a pplying the Triangle Sum Theorem and the Exterior Angle Theorem to find unknown
measures of triangles

•

justifying congruence of triangles

•

writing various forms of proofs

Introduction
Isosceles triangles can be seen throughout our daily lives in structures, supports, architectural details,
and even bicycle frames. Isosceles triangles are a distinct classification of triangles with unique
characteristics and parts that have specific names. In this lesson, we will explore the qualities of
isosceles triangles.
Key Concepts
•

Isosceles triangles have at least two congruent sides, called legs.

•

The angle created by the intersection of the legs is called the vertex angle.

•

Opposite the vertex angle is the base of the isosceles triangle.

•

E ach of the remaining angles is referred to as a base angle. The intersection of one leg and the
base of the isosceles triangle creates a base angle.

U1-565
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CCGPS Analytic Geometry Teacher Resource

UNIT 1 • SIMILARITY, CONGRUENCE, AND PROOFS
Lesson 9: Proving Theorems About Triangles
Instruction
Vertex angle

Leg

Leg

Base angle

•

Base

Base angle

The following theorem is true of every isosceles triangle.
Theorem
Isosceles Triangle Theorem
If two sides of a triangle are congruent, then the angles opposite the
congruent sides are congruent.
A

B

m∠B ≅ m∠C

C

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CCGPS Analytic Geometry Teacher Resource

© Walch Education

UNIT 1 • SIMILARITY, CONGRUENCE, AND PROOFS
Lesson 9: Proving Theorems About Triangles
Instruction
•

If the Isosceles Triangle Theorem is reversed, then that statement is also true.

•

This is known as the converse of the Isosceles Triangle Theorem.
Theorem
Converse of the Isosceles Triangle Theorem
If two angles of a triangle are congruent, then the sides opposite those
angles are congruent.
A

B

C

AB ≅ AC
•

I f the vertex angle of an isosceles triangle is bisected, the bisector is perpendicular to the base,
creating two right triangles.

U1-567
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CCGPS Analytic Geometry Teacher Resource

UNIT 1 • SIMILARITY, CONGRUENCE, AND PROOFS
Lesson 9: Proving Theorems About Triangles
Instruction
•

In the diagram that follows, D is the midpoint of BC .
A

B

D

C

•

E quilateral triangles are a special type of isosceles triangle, for which each side of the triangle
is congruent.

•

If all sides of a triangle are congruent, then all angles have the same measure.
Theorem
If a triangle is equilateral then it is equiangular, or has equal angles.
B

A

C

∠A ≅ ∠B ≅ ∠C
U1-568
CCGPS Analytic Geometry Teacher Resource

© Walch Education

UNIT 1 • SIMILARITY, CONGRUENCE, AND PROOFS
Lesson 9: Proving Theorems About Triangles
Instruction
•

Each angle of an equilateral triangle measures 60˚ (180 ÷ 3 = 60 ).

•

Conversely, if a triangle has equal angles, it is equilateral.
Theorem
If a triangle is equiangular, then it is equilateral.

AB ≅ BC ≅ AC
•

These theorems and properties can be used to solve many triangle problems.

Common Errors/Misconceptions
•

incorrectly identifying parts of isosceles triangles

•

not identifying equilateral triangles as having the same properties of isosceles triangles

•

incorrectly setting up and solving equations to find unknown measures of triangles

•

misidentifying or leaving out theorems, postulates, or definitions when writing proofs

U1-569
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CCGPS Analytic Geometry Teacher Resource

UNIT 1 • SIMILARITY, CONGRUENCE, AND PROOFS
Lesson 9: Proving Theorems About Triangles
Instruction
Guided Practice 1.9.2
Example 1
Find the measure of each angle of ABC .
A

(4x)˚

(6x – 36)˚

B

C

1. Identify the congruent angles.
The legs of an isosceles triangle are congruent; therefore, AB ≅ AC .
The base of ABC is BC .
∠B and ∠C are base angles and are congruent.
2. Calculate the value of x.
Congruent angles have the same measure.
Create an equation.
m∠B = m∠C

The measures of base angles of
isosceles triangles are equal.

4x = 6x – 36

Substitute values for m∠B and
m∠C.

–2x = –36

Solve for x.

x = 18

U1-570
CCGPS Analytic Geometry Teacher Resource

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UNIT 1 • SIMILARITY, CONGRUENCE, AND PROOFS
Lesson 9: Proving Theorems About Triangles
Instruction
3. Calculate each angle measure.
m∠B = 4x = 4(18) = 72
m∠C = 6(18) – 36 = 72

Substitute the value of x into the
expression for m∠B.
Substitute the value of x into the
expression for m∠C.

m∠A + m∠B + m∠C = 180 The sum of the angles of a triangle
is 180˚.
m∠A + 72 + 72 = 180

Substitute the known values.

m∠A = 36

Solve for m∠A.

4. Summarize your findings.
m∠A = 36
m∠B = 72
m∠C = 72							

U1-571
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CCGPS Analytic Geometry Teacher Resource

UNIT 1 • SIMILARITY, CONGRUENCE, AND PROOFS
Lesson 9: Proving Theorems About Triangles
Instruction
Example 2
Determine whether ABC with vertices A (–4, 5), B (–1, –4), and C (5, 2) is an isosceles triangle. If it
is isosceles, name a pair of congruent angles.
1. Use the distance formula to calculate the length of each side.
Calculate the length of AB .
d = ( x2 − x1 ) 2 + ( y2 − y1 ) 2
AB =

[( −1) − ( −4) ]2 + [( −4) − (5) ]2

AB = (3) 2 + ( −9) 2

Substitute (–4, 5) and (–1, –4)
for (x1, y1) and (x2, y2).
Simplify.

AB = 9 + 81
AB = 90 = 3 10
Calculate the length of BC .
d = ( x2 − x1 ) 2 + ( y2 − y1 ) 2
BC =

[(5) − ( −1) ]2 + [(2) − ( −4) ]2

BC = (6) 2 + (6) 2

Substitute (–1, –4) and (5, 2)
for (x1, y1) and (x2, y2).
Simplify.

BC = 36 + 36
BC = 72 = 6 2
Calculate the length of AC .
d = ( x2 − x1 ) 2 + ( y2 − y1 ) 2
AC =

[(5) − ( −4) ]2 + [(2) − (5) ]2

AC = (9) 2 + ( −3) 2

Substitute (–4, 5) and (5, 2)
for (x1, y1) and (x2, y2).
Simplify.

AC = 81 + 9
AC = 90 = 3 10
U1-572
CCGPS Analytic Geometry Teacher Resource

© Walch Education

UNIT 1 • SIMILARITY, CONGRUENCE, AND PROOFS
Lesson 9: Proving Theorems About Triangles
Instruction
2. Determine if the triangle is isosceles.
A triangle with at least two congruent sides is an isosceles triangle.
AB ≅ AC , so ABC is isosceles.
3. Identify congruent angles.
If two sides of a triangle are congruent, then the angles opposite
the sides are congruent.
∠B ≅ ∠C 							
Example 3
Given AB ≅ AC , prove that ∠B ≅ ∠C .
A

B

C

1. State the given information.
AB ≅ AC

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CCGPS Analytic Geometry Teacher Resource

UNIT 1 • SIMILARITY, CONGRUENCE, AND PROOFS
Lesson 9: Proving Theorems About Triangles
Instruction
2. D
 raw the angle bisector of ∠A and extend it to BC , creating the
perpendicular bisector of BC . Label the point of intersection D.
Indicate congruent sides.
A

B

C

D

∠B and ∠C are congruent corresponding parts.
3. Write the information in a two-column proof.
Statements
1. AB ≅ AC

Reasons
1. Given

 here is exactly one line
2. D
 raw the angle bisector of ∠A 2. T
through two points.
and extend it to BC , creating
a perpendicular bisector of
BC and the midpoint of BC .
3. Definition of midpoint
3. BD ≅ BC
4. Reflexive Property
4. AD ≅ AD
5. SSS Congruence Statement
5.  ABD ≅ ACD
6. C
 orresponding Parts of
6. ∠B ≅ ∠C
Congruent Triangles are
Congruent
									
U1-574
CCGPS Analytic Geometry Teacher Resource

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UNIT 1 • SIMILARITY, CONGRUENCE, AND PROOFS
Lesson 9: Proving Theorems About Triangles
Instruction
Example 4
Find the values of x and y.

(4x + 24)˚

(11y – 23)˚

1. Make observations about the figure.
The triangle in the diagram has three congruent sides.
A triangle with three congruent sides is equilateral.
Equilateral triangles are also equiangular.
The measure of each angle of an equilateral triangle is 60˚.
An exterior angle is also included in the diagram.
The measure of an exterior angle is the supplement of the adjacent
interior angle.

U1-575
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CCGPS Analytic Geometry Teacher Resource

UNIT 1 • SIMILARITY, CONGRUENCE, AND PROOFS
Lesson 9: Proving Theorems About Triangles
Instruction
2. Determine the value of x.
The measure of each angle of an equilateral triangle is 60˚.
Create and solve an equation for x using this information.
4x + 24 = 60

Equation

4x = 36

Solve for x.

x=9
The value of x is 9.
3. Determine the value of y.
The exterior angle is the supplement to the interior angle.
The interior angle is 60˚ by the properties of equilateral triangles.
The sum of the measures of an exterior angle and interior angle pair
equals 180.
Create and solve an equation for y using this information.
11y – 23 + 60 = 180

Equation

11y + 37 = 180

Simplify.

11y = 143

Solve for y.

y = 13
The value of y is 13.						

U1-576
CCGPS Analytic Geometry Teacher Resource

© Walch Education

UNIT 1 • SIMILARITY, CONGRUENCE, AND PROOFS
Lesson 9: Proving Theorems About Triangles
Instruction
Example 5
ABC is equilateral. Prove that it is equiangular.
1. State the given information.
ABC is an equilateral triangle.
2. Plan the proof.
Equilateral triangles are also isosceles triangles.
Isosceles triangles have at least two congruent sides.
AB ≅ BC
∠A and ∠C are base angles in relation to AB and BC .
∠A ≅ ∠C because of the Isosceles Triangle Theorem.
BC ≅ AC
∠A and ∠B are base angles in relation to BC and AC .
∠A ≅ ∠B because of the Isosceles Triangle Theorem.
By the Transitive Property, ∠A ≅ ∠B ≅ ∠C ; therefore, ABC is
equiangular.
3. Write the information in a paragraph proof.
Since ABC is equilateral, AB ≅ BC and BC ≅ AC . By the Isosceles
Triangle Theorem, ∠A ≅ ∠C and ∠A ≅ ∠B . By the Transitive
Property, ∠A ≅ ∠B ≅ ∠C ; therefore, ABC is equiangular.

U1-577
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CCGPS Analytic Geometry Teacher Resource



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Create Date                     : 2013:07:12 13:42:39-04:00
Modify Date                     : 2013:09:07 16:13:22-04:00
Metadata Date                   : 2013:09:07 16:13:22-04:00
Creator Tool                    : Adobe InDesign CS5 (7.0.3)
Page Image Page Number          : 1, 2
Page Image Format               : JPEG, JPEG
Page Image Width                : 256, 256
Page Image Height               : 256, 256
Page Image                      : (Binary data 8540 bytes, use -b option to extract), (Binary data 7524 bytes, use -b option to extract)
Doc Change Count                : 11389
Format                          : application/pdf
Title                           : AG TRB U1.indb
Producer                        : Adobe PDF Library 9.9
Trapped                         : False
GTS PDFX Version                : PDF/X-1:2001
GTS PDFX Conformance            : PDF/X-1a:2001
Page Count                      : 13
Creator                         : Adobe InDesign CS5 (7.0.3)

EXIF Metadata provided by EXIF.tools