19 12 15 7 8 14 11 20.

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Presentation transcript:

  19 12 15 7 8 14 11 20

Parallel Lines and transversals

Corresponding Angles     1 2 3 4 5 6 7 8

Alternate Exterior Angles     1 2 3 4 5 6 7 8

Alternate Interior Angles     1 2 3 4 5 6 7 8

Same Side Interior Angles If 2 ││ (parallel) lines are cut by a transversal, then the same side int ∠s R supplementary.   1 2 3 4 5 6 7 8

Ex. 1 Solve for x. x 60°

Ex. 2 Solve for x and y. x y 143°

Ex. 3 Solve for x and y. x 152° y

Ex. 4 Solve for x, y and z. x 24° y z

Warm Up Find the missing angle measures. m∠14 m∠7 m∠8 m∠12 m∠20 8 12 7 14 105° 20

Using Algebra with Parallel Lines

Ex. 1 Solve for x. 3x 60°

Ex. 2 Solve for x. 2x + 90 x + 30

Ex. 3 Solve for x and y. y 106° 2x

Ex. 4 Solve for y. (y – 20)° y 70°

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