Lines and Angles Flashcard

Front

What is a straight angle?

Back

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

Front

What are perpendicular lines?

Back

Perpendicular lines are lines that intersect at a right angle (90 degrees).

Front

What are parallel lines?

Back

Parallel lines are lines in a plane that never intersect and are always the same distance apart.

Front

What is an acute angle?

Back

An acute angle is an angle that measures less than 90 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 does it mean for lines to intersect?

Back

Lines intersect when they cross each other at a point.

Front

How can you identify a right angle?

Back

A right angle can be identified by its measurement of 90 degrees or by using a right angle tool like a protractor.

Front

What is the sum of angles in a straight line?

Back

The sum of angles on a straight line is always 180 degrees.

Front

What is the sum of angles in a triangle?

Back

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

Front

What is a transversal line?

Back

A transversal line is a line that crosses two or more other lines.