Classifying Triangles Students will classify triangles using the lengths of the sides and the angles. S. Calahan October 2010

Classifying triangles by angles  Acute triangle – all of the angles are acute

Classifying triangles by angles  Obtuse triangle – one angles is obtuse

Classifying triangles by angles  Right triangle – one angles is 90°

Classify the triangle by it’s angles 85° 55°40°

Right Acute Triangle

Classify the triangle by it’s angles 60° 30°

Right Right triangle

Classifying the triangle by it’s angles 110°

Right Obtuse Triangle

Classify triangles by sides  Scalene triangle – no sides are congruent

Classify triangles by sides  Isosceles triangle – at least 2 sides are congruent.

Classify triangles by sides  Equilateral triangles – all sides of a triangle are congruent

Classify triangles by sides

Right Isosceles triangle

Classify triangles by sides

Right Scalene Triangle

Classify the triangle using the sides

Right Equilateral Triangle

Classify the triangle using the sides

Right Isosceles Triangle