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Question

In parallelogram ABCD, AR and DP are the angle bisectors of angles A and D respectively.If ADS=45°, then the value of PSR is .

A
90°
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B
45°
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C
135°
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D
75°
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Solution

The correct option is A 90°
Given figure,

ADS=45°
Co - interior angles are supplementary, and AR and DP are angle bisectors,
A+D=180°
ADS+DAS=90°
Hence, DSA=90° (Angle sum property of ASD)
PSR and DSA are vertically opposite angles,
DSA=PSR=90°

Hence, the value of PSR is 90°.

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