Parallel and Perpendicular Lines

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What is the definition of parallel lines?

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

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CCSS.HSG.CO.A.1

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What is the definition of perpendicular lines?

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

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CCSS.4.G.A.1

CCSS.HSG.CO.A.1

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CCSS.8.EE.B.6

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CCSS.8.EE.B.5

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These lines are perpendicular because their slopes are opposite reciprocals.

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CCSS.8.EE.B.6

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What is the relationship between the slopes of parallel lines?

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The slopes of parallel lines are equal.

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CCSS.8.EE.B.5

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What is the relationship between the slopes of intersecting lines?

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Intersecting lines can have any slopes; they are not necessarily parallel or perpendicular.

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CCSS.8.EE.B.5

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CCSS.8.EE.B.6

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CCSS.8.EE.B.6