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

4-1 Classifying Triangles Geometry

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

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

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

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

2a.) 2b.) Ex. 2 Classify each triangle by its side lengths. H E 10 F 4 G 12 11 2a.) 2b.)

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