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प्रश्न
In Fig. 16.20, find the measure of ∠MPN.
उत्तर
\[\text{ Since the sum of all the angles of a quadrilateral is } 360°, \text{ we have } : \]
\[45° + 90° + 90° + ∠MPN = 360° \]
\[ \Rightarrow 225° + ∠MPN = 360°\]
\[ \therefore ∠MPN = 135° \]
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