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Say angle 1 is 40 which means that if angle 3 is congruent then angle 3 is also 40 by definition of vertical angles. That would make angle 2 equal to 140 by definition of a linear pair and so angle 4 is congruent by vertical angles.

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Q: What is a counterexample for all intersecting lines form right angles?
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What intersecting lines make right angles?

All of them. If its truly intersecting lines, they have to form right angles. All of them. If its truly intersecting lines, they have to form right angles.


What are lines that intersect and form acute and obtuse angles called?

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How is perpendicular lines similar to intersecting lines?

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