Triangle Characteristics Flashcard

Front

What is a triangle?

Back

A triangle is a three-sided polygon.

Front

What are the types of angles in a triangle?

Back

Acute angle (less than 90°), Right angle (exactly 90°), Obtuse angle (more than 90°).

Front

What is an acute angle?

Back

An angle that measures less than 90°.

Front

What is a right angle?

Back

An angle that measures exactly 90°.

Front

What is an obtuse angle?

Back

An angle that measures more than 90°.

Front

What is the sum of the angles in a triangle?

Back

The sum of the angles in a triangle is always 180°.

Front

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

Back

It is a right triangle.

Front

If two angles in a triangle are equal, what type of triangle is it?

Back

It is an isosceles triangle.

Front

What is the measure of the third angle if two angles are 70° each?

Back

The third angle measures 40°.

Front

What is the measure of an obtuse angle?

Back

An obtuse angle measures more than 90° but less than 180°.