Parallel and Perpendicular

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). Their slopes are negative reciprocals of each other.

Tags

CCSS.4.G.A.1

CCSS.HSG.CO.A.1

Front

If two lines have slopes m1 and m2, what condition indicates they are parallel?

Back

If m1 = m2, then the lines are parallel.

Tags

CCSS.8.EE.B.6

Front

If two lines have slopes m1 and m2, what condition indicates they are perpendicular?

Back

If m1 * m2 = -1, then the lines are perpendicular.

Tags

CCSS.8.EE.B.6

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

What is the slope of a horizontal line?

Back

The slope of a horizontal line is 0.

Tags

CCSS.8.EE.B.5

Front

Are lines with slopes 1/5 and 1/5 parallel, perpendicular, or neither?

Back

They are parallel.

Tags

CCSS.8.EE.B.6

Front

Are lines with slopes 3/4 and 4/3 parallel, perpendicular, or neither?

Back

They are neither.

Tags

CCSS.8.EE.B.6

Front

True or False: Perpendicular lines have the same slope.

Back

False.

Tags

CCSS.8.EE.B.6

Front

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

Back

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

Tags

CCSS.8.EE.B.6