Lines and Angles

Front

An angle that measures exactly 180 degrees is -

Back

a straight angle

Front

What do we call lines that never meet and are always the same distance apart?

Back

parallel lines

Front

What do we call lines that cross each other at a right angle?

Back

perpendicular lines

Front

What do we call a part of a line that has two endpoints?

Back

a line segment

Front

What do we call a line that extends infinitely in one direction?

Back

a ray

Front

What is the term for an angle that measures less than 90 degrees?

Back

acute angle

Front

What is the term for an angle that measures more than 90 degrees but less than 180 degrees?

Back

obtuse angle

Front

What do we call the point where two lines meet?

Back

a point

Front

What do we call angles that add up to 90 degrees?

Back

complementary angles

Front

What do we call angles that add up to 180 degrees?

Back

supplementary angles