8.
In a parallelogram PQRS, the sum of the angles ZR and ZS is :
a) 90°
b) 180° c) 270° d) 360°
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Option(b)180
Sum of cointerior angle is 180 degree since in a parallelogram opposite sides are parallel
Sum of cointerior angle is 180 degree since in a parallelogram opposite sides are parallel
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