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Lesson7.notebook September 04, 2015
LESSON 7 - SOLVING FOR UNKNOWN ANGLES - TRANSVERSALS
transversal
Exterior <s
Interior <s
a coplanar line that intersects 2 other coplanar lines in different points
Lesson7.notebook September 04, 2015
Corresponding angles: angles occupying corresponding positions relative to the two lines
1
2
1
2
2
1
1
2
Same-side interior angles: two interior angles on the same side of the transversal
1 1
2 21
2
Lesson7.notebook September 04, 2015
Alternate interior angles: two interior angles on opposite sides of the transversal
12
1
2
Alternate exterior angles: two exterior angles that are on opposite sides of the transversal
1
2
1
2
Lesson7.notebook September 04, 2015
Postulate: If lines are parallel, then corresponding angles are congruent.
Theorem: If lines are parallel, then alternate interior angles are congruent.
Theorem: If lines are parallel, then alternate exterior angles are congruent.
Theorem: If lines are parallel, then same-side interior angles are supplementary.
If 2 ll lines are cut by a transversal, then: