Classify Triangles/Triangle Sum

Front

What is a triangle?

Back

A triangle is a three-sided polygon.

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

What is an acute triangle?

Back

An acute triangle is a triangle where all three angles are less than 90 degrees.

Front

How many acute angles must an acute triangle have?

Back

An acute triangle must have 3 acute angles.

Front

What is a right triangle?

Back

A right triangle is a triangle that has one angle measuring 90 degrees.

Front

What is an obtuse triangle?

Back

An obtuse triangle is a triangle that has one angle measuring more than 90 degrees.

Front

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

Back

It is a right triangle.

Front

If a triangle has one angle that is 120 degrees, what type of triangle is it?

Back

It is an obtuse triangle.

Front

What is the measure of the missing angle if two angles are 50 degrees and 60 degrees?

Back

The missing angle is 70 degrees.

Front

What is the measure of the missing angle if two angles are 80 degrees and 30 degrees?

Back

The missing angle is 70 degrees.