Classifying Triangles by Sides and Angles

Front

Classify the triangle by its sides: What are the three types of triangles based on their sides?

Back

Equilateral, Isosceles, Scalene

Front

What is an acute triangle?

Back

A triangle with three angles that each measure less than 90°.

Front

If a triangle has one angle measuring more than 90°, what type of triangle is it?

Back

Obtuse triangle.

Front

What type of triangle has two sides of equal length?

Back

Isosceles triangle.

Front

What type of triangle has all sides of different lengths?

Back

Scalene triangle.

Front

If a triangle has all three angles measuring 60°, what type of triangle is it?

Back

Equilateral triangle.

Front

What is the sum of the angles in any triangle?

Back

180°.

Front

If one angle of a triangle measures 90°, what type of triangle is it?

Back

Right triangle.

Front

How do you find the measure of a missing angle in a triangle?

Back

Subtract the sum of the known angles from 180°.

Front

What is the definition of a right triangle?

Back

A triangle that has one angle measuring exactly 90°.