parallel and perpendicular lines

Front

What are parallel lines?

Back

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

Front

What are perpendicular lines?

Back

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

Front

What are intersecting lines?

Back

Lines that cross each other at any angle.

Front

What is the point of intersection?

Back

The point where two lines meet or cross.

Front

How do you identify parallel lines in a diagram?

Back

Look for lines that are equidistant and never touch.

Front

How do you identify perpendicular lines in a diagram?

Back

Look for lines that form a right angle (90 degrees) when they cross.

Front

What is a ray in geometry?

Back

A part of a line that starts at a point and extends infinitely in one direction.

Front

What is the starting point of a ray called?

Back

The endpoint.

Front

If two lines are perpendicular, what is the angle between them?

Back

90 degrees.

Front

What is the slope of a line that is perpendicular to a line with a slope of 2?

Back

-1/2 (the negative reciprocal of 2).