section 4.3. warm up 1. find each angle measure. true or false. if false explain. 2. every...
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![Page 1: Section 4.3. Warm Up 1. Find each angle measure. True or False. If false explain. 2. Every equilateral triangle is isosceles. 3. Every isosceles triangle](https://reader031.vdocuments.net/reader031/viewer/2022032605/56649e745503460f94b73f1b/html5/thumbnails/1.jpg)
Section 4.3
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Warm Up
1. Find each angle measure.
True or False. If false explain.
2. Every equilateral triangle is isosceles.
3. Every isosceles triangle is equilateral.
![Page 3: Section 4.3. Warm Up 1. Find each angle measure. True or False. If false explain. 2. Every equilateral triangle is isosceles. 3. Every isosceles triangle](https://reader031.vdocuments.net/reader031/viewer/2022032605/56649e745503460f94b73f1b/html5/thumbnails/3.jpg)
Isosceles Triangle Theorem-If two sides of a triangle are congruent, then the angles opposite those sides are congruent.
Since , then:
The base is:The vertex angle is:The legs are:The base angles are:
∠A is congruent to ∠C
![Page 4: Section 4.3. Warm Up 1. Find each angle measure. True or False. If false explain. 2. Every equilateral triangle is isosceles. 3. Every isosceles triangle](https://reader031.vdocuments.net/reader031/viewer/2022032605/56649e745503460f94b73f1b/html5/thumbnails/4.jpg)
Name the angles that must be congruent.
![Page 5: Section 4.3. Warm Up 1. Find each angle measure. True or False. If false explain. 2. Every equilateral triangle is isosceles. 3. Every isosceles triangle](https://reader031.vdocuments.net/reader031/viewer/2022032605/56649e745503460f94b73f1b/html5/thumbnails/5.jpg)
Find the value of x in each isosceles triangle.
![Page 6: Section 4.3. Warm Up 1. Find each angle measure. True or False. If false explain. 2. Every equilateral triangle is isosceles. 3. Every isosceles triangle](https://reader031.vdocuments.net/reader031/viewer/2022032605/56649e745503460f94b73f1b/html5/thumbnails/6.jpg)
If two angles of a triangle are congruent, then the sides opposite those angles are congruent.
![Page 7: Section 4.3. Warm Up 1. Find each angle measure. True or False. If false explain. 2. Every equilateral triangle is isosceles. 3. Every isosceles triangle](https://reader031.vdocuments.net/reader031/viewer/2022032605/56649e745503460f94b73f1b/html5/thumbnails/7.jpg)
Name the sides that must be congruent.
![Page 8: Section 4.3. Warm Up 1. Find each angle measure. True or False. If false explain. 2. Every equilateral triangle is isosceles. 3. Every isosceles triangle](https://reader031.vdocuments.net/reader031/viewer/2022032605/56649e745503460f94b73f1b/html5/thumbnails/8.jpg)
Find the value of x in each isosceles triangle.
![Page 9: Section 4.3. Warm Up 1. Find each angle measure. True or False. If false explain. 2. Every equilateral triangle is isosceles. 3. Every isosceles triangle](https://reader031.vdocuments.net/reader031/viewer/2022032605/56649e745503460f94b73f1b/html5/thumbnails/9.jpg)
Find mF.
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Find mG.
![Page 11: Section 4.3. Warm Up 1. Find each angle measure. True or False. If false explain. 2. Every equilateral triangle is isosceles. 3. Every isosceles triangle](https://reader031.vdocuments.net/reader031/viewer/2022032605/56649e745503460f94b73f1b/html5/thumbnails/11.jpg)
Find mH.
![Page 12: Section 4.3. Warm Up 1. Find each angle measure. True or False. If false explain. 2. Every equilateral triangle is isosceles. 3. Every isosceles triangle](https://reader031.vdocuments.net/reader031/viewer/2022032605/56649e745503460f94b73f1b/html5/thumbnails/12.jpg)
Find mN.
![Page 13: Section 4.3. Warm Up 1. Find each angle measure. True or False. If false explain. 2. Every equilateral triangle is isosceles. 3. Every isosceles triangle](https://reader031.vdocuments.net/reader031/viewer/2022032605/56649e745503460f94b73f1b/html5/thumbnails/13.jpg)
Find the value of x.
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Find the value of y.
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Find the value of JK.
![Page 16: Section 4.3. Warm Up 1. Find each angle measure. True or False. If false explain. 2. Every equilateral triangle is isosceles. 3. Every isosceles triangle](https://reader031.vdocuments.net/reader031/viewer/2022032605/56649e745503460f94b73f1b/html5/thumbnails/16.jpg)
Find each angle measure.
1. mR
2. mP
Find each value.
3. x 4. y
5. x
Lesson Quiz