1.4:Line and Angle Relationships

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1.4Line and Angle Relationships
-Angles related to parallel lines and transversals
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Corresponding ?s

• If 2 ?? lines are cut by a transversal, then the
  pairs of corresponding ?s are ?.
• i.e. If l ??m, then ?1??2.

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Alt. Int. ?s

• If 2 ?? lines are cut by a transversal, then the
  pairs of alternate interior ?s are ?.
• i.e. If l ??m, then ?1??2.

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Alt. Ext. ?s

• If 2 ?? lines are cut by a transversal, then the
  pairs of alternate exterior ?s are ?.
• i.e. If l ??m, then ?1??2.

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Consecutive Int. (same-side interior)

• If 2 ?? lines are cut by a transversal, then the
  pairs of consecutive int. ?s are supplementary.
• i.e. If l ??m, then ?1 ?2 are supp.

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? Transversal

• If a transversal is ? to one of 2 ?? lines, then
  it is ? to the other.
• i.e. If l ??m, t ? l, then t ?m.

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• Ex Find
• m?1
• m?2
• m?3
• m?4
• m?5
• m?6
• x

1
125o 2
3
5
4 6
x15o
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Ex.2.
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• Solve for x and
• Find all the angle
• measures

8 4x-8
3
6x 12
4 6
9
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Find mlt1
Find mlt1
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Assignment