Warm-Up Find the value of x. x + 25 3x - 3. GEOMETRY 4-8 Isosceles and Equilateral Triangles.

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Warm-Up • Find the value of x. x + 25 3x - 3

Transcript of Warm-Up Find the value of x. x + 25 3x - 3. GEOMETRY 4-8 Isosceles and Equilateral Triangles.

Page 1: Warm-Up Find the value of x. x + 25 3x - 3. GEOMETRY 4-8 Isosceles and Equilateral Triangles.

Warm-Up• Find the value of x.

x + 25

3x - 3

Page 2: Warm-Up Find the value of x. x + 25 3x - 3. GEOMETRY 4-8 Isosceles and Equilateral Triangles.

GEOMETRY 4-8Isosceles and Equilateral Triangles

Page 3: Warm-Up Find the value of x. x + 25 3x - 3. GEOMETRY 4-8 Isosceles and Equilateral Triangles.

Parts of an Isosceles Triangle

Base: the side opposite the vertex angle

Base angle Base angle

Leg: a congruent side Leg: a congruent side

Vertex angle: formed by the two legs

Page 4: Warm-Up Find the value of x. x + 25 3x - 3. GEOMETRY 4-8 Isosceles and Equilateral Triangles.

Theorem

• Isosceles Triangle Theorem:• If two sides of a triangle are congruent, then the angles opposite those sides are congruent.

If

Then

Page 5: Warm-Up Find the value of x. x + 25 3x - 3. GEOMETRY 4-8 Isosceles and Equilateral Triangles.

Examples• Find the value of x.

55°

x + 4°1)

2)

Page 6: Warm-Up Find the value of x. x + 25 3x - 3. GEOMETRY 4-8 Isosceles and Equilateral Triangles.

Equilateral Triangles

• Equilateral Theorem:• All equilateral triangles are equiangular.• All equiangular triangles are equilateral.

Page 7: Warm-Up Find the value of x. x + 25 3x - 3. GEOMETRY 4-8 Isosceles and Equilateral Triangles.

Examples• Find the value of x. Find the value of y.


CorrectionKey=NL-C;CA-C Name Class Date 7.2 Isosceles and ...Explain 3 Using Properties of Isosceles and Equilateral Triangles You can use the properties of isosceles and equilateral

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4.6 Isosceles, Equilateral, and Right Trianglesmrmeyersmath.weebly.com/uploads/4/9/6/9/49699347/... · 4.6 Isosceles, Equilateral, and Right Triangles 237 Proof of the Base Angles

4.6 Isosceles, Equilateral, and Right Trianglesmrmeyersmath.weebly.com/uploads/4/9/6/9/49699347/... · 4.6 Isosceles, Equilateral, and Right Triangles 237 Proof of the Base Angles

Isosceles and Equilateral Triangles EXAMPLE,3 B. Find the ...€¦ · Isosceles and Equilateral Triangles Isosceles Triangle leg base angles vertex Isosceles and Equilateral Triangles

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4.8 Use Isosceles and Equilateral Triangles

4.8 Use Isosceles and Equilateral Triangles

Triangle Angle Sum Theorem Isosceles Triangles Equilateral Triangle.

Triangle Angle Sum Theorem Isosceles Triangles Equilateral Triangle.

4.8 Use Isosceles and Equilateral Triangles You will use theorems about isosceles and equilateral triangles. Essential Question: How are the sides and.

4.8 Use Isosceles and Equilateral Triangles You will use theorems about isosceles and equilateral triangles. Essential Question: How are the sides and.

4-6 Isosceles and Equilateral Triangles

4-6 Isosceles and Equilateral Triangles

4.6 Isosceles, Equilateral, and Right Triangles

4.6 Isosceles, Equilateral, and Right Triangles

Isosceles and equilateral triangles. Warm Up 1. Find each angle measure. True or False. If false explain. 2. Every equilateral triangle is isosceles.

Isosceles and equilateral triangles. Warm Up 1. Find each angle measure. True or False. If false explain. 2. Every equilateral triangle is isosceles.

4.7 use isosceles and equilateral triangles

4.7 use isosceles and equilateral triangles

Isosceles and Equilateral Triangles

Isosceles and Equilateral Triangles

7.2 Isosceles and Equilateral Triangles.notebook€¦ · 7.2 Isosceles and Equilateral Triangles.notebook January 04, 2017 Try This: pg 289; 4-13, 15-18

7.2 Isosceles and Equilateral Triangles.notebook€¦ · 7.2 Isosceles and Equilateral Triangles.notebook January 04, 2017 Try This: pg 289; 4-13, 15-18

Triangles and Quadrilaterals 4.1 ~ Isosceles and ... ~ Isosceles and Equilateral Triangles and Midsegments Worksheet 4.1 ... 2 13. x = 3, y = 5, all sides 15 14. x = 58, r = 5, ...

Triangles and Quadrilaterals 4.1 ~ Isosceles and ... ~ Isosceles and Equilateral Triangles and Midsegments Worksheet 4.1 ... 2 13. x = 3, y = 5, all sides 15 14. x = 58, r = 5, ...

Holt McDougal Geometry 4-9 Isosceles and Equilateral Triangles 4-9 Isosceles and Equilateral Triangles Holt Geometry Warm Up Warm Up Lesson Presentation.

Holt McDougal Geometry 4-9 Isosceles and Equilateral Triangles 4-9 Isosceles and Equilateral Triangles Holt Geometry Warm Up Warm Up Lesson Presentation.

Isosceles and Equilateral Triangles · SWBAT: Apply Properties of Isosceles and Equilateral Triangles HW: Pages 22-23 40 40 x 𝒙+ + = x = 100 Title Isosceles and Equilateral Triangles

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5.4 Equilateral and Isosceles Triangles...Section 5.4 Equilateral and Isosceles Triangles 251 5.4 Writing a Conjecture about Isosceles Triangles Work with a partner. Use dynamic geometry

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Isosceles and Equilateral Triangles Chapter 4 Section 5.

Isosceles and Equilateral Triangles Chapter 4 Section 5.

Holt Geometry 4-7 Isosceles and Equilateral Triangles 4-7 Isosceles and Equilateral Triangles Holt Geometry Warm Up Warm Up Lesson Presentation Lesson.

Holt Geometry 4-7 Isosceles and Equilateral Triangles 4-7 Isosceles and Equilateral Triangles Holt Geometry Warm Up Warm Up Lesson Presentation Lesson.

4.7 Isosceles and Equilateral Triangles

4.7 Isosceles and Equilateral Triangles

Then/Now You identified isosceles and equilateral triangles. Use properties of isosceles triangles. Use properties of equilateral triangles.

Then/Now You identified isosceles and equilateral triangles. Use properties of isosceles triangles. Use properties of equilateral triangles.