In Fig. 16.20, find the measure of ∠MPN.

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Solution

$Since the sum of all the angles of a quadrilateral is 360 °, we have : 45 ° + 90 ° + 90 ° + ∠ MPN = 360 ° \Rightarrow 225 ° + ∠ MPN = 360 ° ∴ ∠ MPN = 135 °$

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In Fig. 16.20, find the measure of ∠MPN.

Since the sum of all the angles of a quadrilateral is 360°, we have:45°+90°+90°+∠MPN=360°⇒225°+∠MPN=360°∴ ∠MPN=135°

$Since the sum of all the angles of a quadrilateral is 360 °, we have : 45 ° + 90 ° + 90 ° + ∠ MPN = 360 ° \Rightarrow 225 ° + ∠ MPN = 360 ° ∴ ∠ MPN = 135 °$