Lines and Angles Flashcard

Front

What are perpendicular lines?

Back

Lines that intersect at a right angle (90 degrees).

Front

What are parallel lines?

Back

Lines that never intersect and are always the same distance apart.

Front

What are intersecting lines?

Back

Lines that cross each other at any angle.

Front

What is a right angle?

Back

An angle that measures exactly 90 degrees.

Front

What is an acute angle?

Back

An angle that measures less than 90 degrees.

Front

What is an obtuse angle?

Back

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

Front

What is a straight angle?

Back

An angle that measures exactly 180 degrees.

Front

How can you identify perpendicular lines in a diagram?

Back

Look for two lines that meet to form a right angle.

Front

How can you identify parallel lines in a diagram?

Back

Look for two lines that are equidistant and never meet.

Front

What is the sum of angles in a triangle?

Back

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