Lines, Angles, and Triangles

Front

What are parallel lines?

Back

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

Front

What is an obtuse triangle?

Back

A triangle with one angle that is greater than 90 degrees.

Front

What is a right angle?

Back

An angle that measures exactly 90 degrees.

Front

What are perpendicular lines?

Back

Lines that intersect at a right angle (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 an acute triangle?

Back

A triangle where all three angles are less than 90 degrees.

Front

What is a straight angle?

Back

An angle that measures exactly 180 degrees.

Front

What is a triangle?

Back

A polygon with three edges and three vertices.

Front

What are intersecting lines?

Back

Lines that cross each other at one point.

Front

What is a scalene triangle?

Back

A triangle with all sides of different lengths.