Parallel lines and transversals

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Intros

Lessons

Relationships between lines and angles

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Examples

Lessons

Find the missing values and then explain your reasoning.
1. $\angle 6$ $\cong$ ?
2. $\angle 2$ $\cong$ ?
3. if m $\angle 8$ = 60°, m $\angle 1$ = ?
4. $\angle 3$ and $\angle ?$ Are supplementary
Find the value of x.
Write a two-column proof.
Given: $\overline {AB}$ $\parallel$ $\overline {CD}$
Prove: $\angle 1$ $\cong$ $\angle 2$

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