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Warm Up Classify each angle as acute, obtuse, or right. 1. 2. 3. PowerPoint Presentation

Warm Up Classify each angle as acute, obtuse, or right. 1. 2. 3.

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### Classifying Triangles

Classify each angle as acute, obtuse, or right.

1.2.

3.

4. If the perimeter is 47, find x and the lengths of the three sides.

right

acute

obtuse

x = 5; 8; 16; 23

Section 4-1

Example: Classifying Triangles by

Angle Measures

Classify BDC by its angle measures.

Classify ADC by its angle measures.

Classify ABD by its angle measures.

Classify FHG by its angle measures.

Example: Classifying Triangles by Side Lengths

Classify EHF by its side lengths.

Classify EHGby its side lengths.

Classify ACD by its side lengths.

Example: Using Triangle Classification

Find the side lengths of JKL.

Find the side lengths of equilateral FGH.

Classify Triangles Given Vertices

- Example: Classify ABC.
A(2, 4), B(3, -1), C(-4, 3)

Classify each triangle by its angles and sides.

1. MNQ

2.NQP

3. MNP

4. Find the side lengths of the triangle.

acute; equilateral

obtuse; scalene

acute; scalene

29; 29; 23

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