Lines, angles, triangles

Front

What is an obtuse triangle?

Back

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

Front

What is a vertex?

Back

A corner or a point where lines meet.

Front

What are parallel lines?

Back

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

Front

What are intersecting lines?

Back

Lines that cross each other at one point.

Front

What are perpendicular lines?

Back

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

Front

What is an acute angle?

Back

An angle that is less than 90 degrees.

Front

What is a right triangle?

Back

A triangle that has one right angle (90 degrees).

Front

What is a line segment?

Back

A part of a line that has two endpoints.

Front

What is a ray?

Back

A part of a line that has one endpoint and extends infinitely in one direction.

Front

What is a triangle?

Back

A polygon with three sides and three angles.