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.... led to the extinction of most dinosaur groups and end the era of dinosaurs
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- Read the proof.Given: AB ∥ DEProve: △ACB ~ △DCEWe are given AB ∥ DE. Because the lines are parallel and segment CB crosses both lines, we can consider segment CB a transversal of the parallel lines. Angles CED and CBA are corresponding angles of transversal CB and are therefore congruent, so ∠CED ≅ ∠CBA. We can state ∠C ≅ ∠C using the reflexive property. Therefore, △ACB ~ △DCE by the