Angles and lines

Front

What is an obtuse angle?

Back

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

Front

What is a right angle?

Back

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

Front

What is an acute angle?

Back

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

Front

What is a straight angle?

Back

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

Front

What do we call two lines that never meet?

Back

Parallel lines.

Front

What do we call two lines that meet at a point?

Back

Intersecting lines.

Front

What is a line segment?

Back

A line segment is a part of a line that has two endpoints.

Front

What is a ray?

Back

A ray is a part of a line that starts at one point and extends infinitely in one direction.

Front

How many degrees are in a full circle?

Back

There are 360 degrees in a full circle.

Front

What is the sum of angles in a triangle?

Back

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