Question
Finish the proof of Theorem 2.9. That is, show that $\angle D A B$ is congruent to $\angle E B A$ and that $m \angle D A B+m \angle A B F=180$.
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Complete each proof shown on page $160 .$ Given: $ \mathrm{m} \angle A B C>\mathrm{m} \angle D B E$ $\mathrm{m} \angle C B D>\mathrm{m} \angle E B F$ Prove: $\mathrm{m} \angle A B D>\mathrm{m} \angle D B F$ (FIGURE CAN'T COPY).
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Parallel and Perpendicular Lines
Perpendicular Lines
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