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Objectives Classify triangles by their angle measures and side lengths. Use triangle classification to find angle measures and side lengths.

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Presentation on theme: "Objectives Classify triangles by their angle measures and side lengths. Use triangle classification to find angle measures and side lengths."— Presentation transcript:

1 Objectives Classify triangles by their angle measures and side lengths. Use triangle classification to find angle measures and side lengths.

2 Vocabulary acute triangle equiangular triangle right triangle
obtuse triangle equilateral triangle isosceles triangle scalene triangle

3 Recall that a triangle is a polygon with three sides.
Triangles can be classified in two ways:

4 B A C List the sides of Triangle ABC: List the vertices:

5 Acute Triangle Equiangular Triangle Right Triangle
Triangle Classification By Angle Measures Acute Triangle Equiangular Triangle Right Triangle

6 Obtuse Triangle One obtuse angle Triangle Classification
By Angle Measures Obtuse Triangle One obtuse angle

7 Example 1A: Classifying Triangles by Angle Measures
Classify BDC by its angle measures.

8 Example 1B: Classifying Triangles by Angle Measures
Classify ABD by its angle measures.

9 Equilateral Triangle Isosceles Triangle Scalene Triangle
Triangle Classification By Side Lengths Equilateral Triangle Isosceles Triangle Scalene Triangle

10 Remember! When you look at a figure, you cannot assume segments are congruent based on appearance. They must be marked as congruent.

11 Example 2A: Classifying Triangles by Side Lengths
Classify EHF by its side lengths.

12 Example 2B: Classifying Triangles by Side Lengths
Classify EHG by its side lengths.

13 Example 3: Using Triangle Classification
Find the side lengths of JKL.

14 Check It Out! Example 3 Find the side lengths of equilateral FGH.


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