Parallel and Perpendicular Lines

Front

What are parallel lines?

Back

Parallel lines are lines in a plane that never meet. They have the same slope.

Tags

CCSS.HSG.CO.A.1

Front

What are perpendicular lines?

Back

Perpendicular lines are lines that intersect at a right angle (90 degrees). The slopes of perpendicular lines are negative reciprocals of each other.

Tags

CCSS.4.G.A.1

CCSS.HSG.CO.A.1

Front

If the slope of line A is m, what is the slope of a line parallel to line A?

Back

The slope of a line parallel to line A is also m.

Tags

CCSS.4.G.A.1

CCSS.HSG.CO.A.1

Front

If the slope of line A is m, what is the slope of a line perpendicular to line A?

Back

The slope of a line perpendicular to line A is -1/m.

Tags

CCSS.8.EE.B.6

Front

What is the slope of a line with a rise of 3 and a run of 4?

Back

The slope is 3/4.

Tags

CCSS.8.EE.B.5

Front

Given the slopes of two lines, how can you determine if they are parallel?

Back

If the slopes of the two lines are equal, then the lines are parallel.

Tags

CCSS.8.EE.B.6

Front

Given the slopes of two lines, how can you determine if they are perpendicular?

Back

If the product of the slopes of the two lines is -1, then the lines are perpendicular.

Front

What is the slope of a horizontal line?

Back

The slope of a horizontal line is 0.

Tags

CCSS.8.EE.B.5

Front

What is the slope of a vertical line?

Back

The slope of a vertical line is undefined.

Tags

CCSS.8.EE.B.5

Front

If line A has a slope of 2, what is the slope of a line that is perpendicular to it?

Back

The slope of the perpendicular line is -1/2.

Tags

CCSS.8.EE.B.6