Classifying Triangles Using Sides and Angles

Look at the sides and angles of this triangle. Which type of triangle is pictured?

• Equilateral Triangle

• Right Isosceles Triangle

• Obtuse Scalene Triangle

• Obtuse Equilateral Triangle

What type of triangle is this? 

• equilateral

• obtuse

• scalene

• isosceles

Classify the following triangle in as many ways as possible. 

• Isosceles, Acute

• Isosceles, Obtuse

• Scalene, Obtuse

• Equilateral, Acute

An equilateral triangle has...

• three angles that are congruent

• two angles that are congruent

• no angles that are congruent

An isosceles triangle has...

• three angles that are congruent

• two angles that are congruent

• no angles that are congruent

A scalene triangle has...

• three angles that are congruent

• two angles that are congruent

• no angles that are congruent

Find the value of x by using the exterior angle theorem.

• A

• B

• C

• D

Which type of triangle is pictured?

• Equilateral Triangle

• Right Isosceles Triangle

• Obtuse Scalene Triangle

• Obtuse Equilateral Triangle

Name the sides from SMALLEST to LARGEST

• RS, ST, TR

• ST, RT, RS

• RT, ST, RS

• RT, RS, ST

Name the angles from LARGEST to SMALLEST

• R, S, T

• S, T, R

• S, R, T

• T, S, R