Parallel Lines Cut by Transversal

Parallel Lines Cut by Transversal

All the Big Angles(obtuse) are Equal

All the Small Angles are Equal

Big + Small =180

Big Angles-1,3,5, and 7

Small Angles-2,4,6, and 8

You can solve for all the angles just by having one!

Angle 1 =120

That means Angle 3,5, and 7=120

How do you figure out angles 2,4,6, and 8?

1 Big + 1 Small =180, so if all the bigs were 120, all the smalls would be 60!

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IF angle 1 is 100, what's angle 3?

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If angle 2 is 50, what's angle 8?

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If angle 1 is 105 degrees, what's angle 2?

Angle Identification

Corresponding-Angles in the same spot on a transversal

These are equal!

Angle Identification

Alternate Interior Angles-In between the parallel lines on opposite sides

They are equal!

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Angle 1 is 120, what's angle 2?

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Angle 7 is 35 degrees, what's angle 8?