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Parallel and Perpendicular Lines

Parallel and Perpendicular Lines

Example 1

Which of the lines in the figure are parallel? Which is the transversal?

Example 2

Which angles are congruent in this figure?

Example 3

What is the relationship between ∠1 and ∠3?

Example 4

If ∠3 has a measure of 138°, what is the measure of an angle adjacent to ∠1?

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