Classifying Triangles and Triangle Measures

Front

What is a triangle?

Back

A triangle is a figure formed by three segments joining three noncollinear points.

Front

What type of triangle has one angle greater than 90 degrees?

Back

An obtuse triangle.

Front

What is the sum of the interior angles of a triangle?

Back

The sum of the interior angles of a triangle is always 180 degrees.

Front

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

Back

It is a right triangle.

Front

What do you call a triangle with all sides of different lengths?

Back

A scalene triangle.

Front

What do you call a triangle with at least two sides of equal length?

Back

An isosceles triangle.

Front

What is the measure of each angle in an equilateral triangle?

Back

Each angle in an equilateral triangle measures 60 degrees.

Front

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

Back

Subtract the sum of the known angles from 180 degrees.

Front

What is the term for a triangle with all angles less than 90 degrees?

Back

An acute triangle.

Front

What is the relationship between the angles in a triangle?

Back

The angles in a triangle are related such that their sum is always 180 degrees.