Triangles and Angles

Front

What is a triangle?

Back

A triangle is a three-sided polygon that has three angles.

Front

What are the types of triangles based on their angles?

Back

1. Acute Triangle: All angles are less than 90°. 2. Right Triangle: One angle is exactly 90°. 3. Obtuse Triangle: One angle is greater than 90°.

Front

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

Back

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

Front

What type of triangle has two equal sides?

Back

An isosceles triangle has two equal sides.

Front

If a triangle has angles measuring 30° and 60°, what is the measure of the third angle?

Back

The third angle measures 90°.

Front

What is an acute angle?

Back

An acute angle is an angle that measures less than 90°.

Front

What is a right angle?

Back

A right angle is an angle that measures exactly 90°.

Front

What is an obtuse angle?

Back

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

Front

What is a straight angle?

Back

A straight angle is an angle that measures exactly 180°.

Front

How can you identify a right triangle?

Back

A right triangle can be identified by having one angle that measures exactly 90°.