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Big Ideas Math Integrated I, 2016 View details

5. Proving Triangle Congruence by SSS

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Exercise 39 Page 624

Which angle of △ DEF has the same number of markings as ∠ B?

∠ E

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Examining the diagram, we see that ∠ B is the angle with three markings. The angle in △ DEF that is congruent to this must also have three markings. We can identify this angle as ∠ E.