1. 4-1 Vocabulary Acute triangle Equiangular triangle Right triangle
Obtuse triangle
Equilateral triangle
Isosceles triangle
Scalene triangle
4-1 Vocabulary

2. 4-1 Classifying Triangles
Geometry

3. Acute Triangle (3 acute angles)
Equiangular Triangle (3 congruent acute angles)

4. Right Triangle (1 right angle)
Obtuse triangle ( 1 obtuse angle)

5. 1a.) 1b.) Ex. 1 Classifying Triangles by Angle Measures A B D C 80°
100°
20°
10°
1a.) 1b.)

6. Triangle Classification by side lengths
Equilateral Triangle (3 congruent sides)
Isosceles Triangle (at least 2 congruent sides)
Scalene Triangle (No congruent sides)

7. 2a.) 2b.) Ex. 2 Classify each triangle by its side lengths. H
E F 4 G 12 11
2a.) 2b.)

8. Ex. 3 Find the side lengths of the triangle.K
J L
4x-10.7
2x + 6.3
5x + 2