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Observing Congruency Using Reflection

In the fig, s...

Question

In the fig, suppose ∠P and ∠Q are supplementary angles and ∠R = 125°. Find the measures of ∠S.

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Solution

Adding the above two equations, we get:

In a quadrilateral PQRS, we have:

From (1) and (2), we get:

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