Geometry: Basic Elements

Front

What is a point?

Back

An exact location.

Front

Are points D and E collinear or coplanar?

Back

Collinear.

Front

A _____ is straight and extends in both directions forever.

Back

Line.

Front

What basic element of geometry does this image show?

Back

A line segment.

Front

What does the image show?

Back

Perpendicular lines.

Front

What is a line segment?

Back

A part of a line that has two endpoints.

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 one point.

Front

What are perpendicular lines?

Back

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

Front

What is a ray?

Back

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