In Fig 6 19, if PQ RS, ∠ MXQ = 135° and ∠ MYR = 40°, find ∠ XMY

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Example 4 : In Fig. 6.19, if PQ || RS, ∠ MXQ = 135° and ∠ MYR = 40°, find ∠ XMY.
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