Lines, Angles, and Triangles

Front

What is a right angle?

Back

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

Front

What are the types of angles?

Back

The types of angles are acute (less than 90 degrees), right (exactly 90 degrees), and obtuse (more than 90 degrees but less than 180 degrees).

Front

What is an obtuse angle?

Back

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

Front

What are the attributes of an obtuse triangle?

Back

An obtuse triangle has one obtuse angle and two acute angles.

Front

What are the attributes of a right triangle?

Back

A right triangle has one right angle and two acute angles.

Front

How many degrees are in a straight angle?

Back

A straight angle measures exactly 180 degrees.

Front

What is the sum of angles in a triangle?

Back

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

Front

What is an acute angle?

Back

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

Front

What is a triangle?

Back

A triangle is a polygon with three edges and three vertices.

Front

What is a scalene triangle?

Back

A scalene triangle is a triangle with all sides of different lengths.