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3 years ago

14

Angles and polygons

1 answer:

Andre45 [30]3 years ago

8 0

Answer:

∠1 = 66°

Step-by-step explanation:

∠1 + ∠3 = ∠4 (exterior angle theorem)

∠1 + 57° = 123°

∠1 = 66°

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