Question

theorems in lines and angles
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Answer 1

Answer:

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Theorem 2 In any triangle, the sum of two interior angles is less than two right angles. Theorem 3 If two lines are intersected by a transversal, and if alternate angles are equal, then the two lines are parallel. Theorem 4 If two parallel lines are intersected by a transversal, then alternate angles are equal.

Answer 2

Refer to the attachments

$\boxed{ \boxed{ \sf \red{All \: theorems \: with \: explanations }}} \:$

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