Lines, Angles, and Triangles

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 is a polygon?

Back

A polygon is a closed figure made up of straight line segments.

Front

What are parallel lines?

Back

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

Front

What are perpendicular lines?

Back

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

Front

What is an acute angle?

Back

An acute angle is an angle that measures less than 90 degrees.

Front

What is a right angle?

Back

A right angle is an angle that measures exactly 90 degrees.

Front

How many sides does a triangle have?

Back

A triangle has three sides.

Front

What is the sum of the angles in a triangle?

Back

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

Front

What is a line segment?

Back

A line segment is a part of a line that has two endpoints.

Front

What are intersecting lines?

Back

Intersecting lines are lines that cross each other at one point.