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In need the proofs and statements

In need the proofs and statements-example-1
User Wizofwor
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Answer:

Since we are given that angle Y = angle Z

The magnitude of the angles will also be equal

∠Y = ∠Z

(x + 10) = (2x - 90)

90 + 10 = 2x - x

100 = x

User Mahima
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