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Classifying Triangles
Students will classify triangles using the lengths of the sides and the angles.
S. CalahanOctober 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
