What will be the Measure of ∠R

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Answer : (4) 144^o

Explanation : –
In a parallelogram PQRS,

Let the angle Q be X
Then, the angle P = 4 X
As we know that, Sum of two adjacent angle of a parallelogram is 180^o
Then, X + 4 X  = 180
5 X = 180
X = 180/5
X = 36^o
Then, Angle R + Angle Q = 180^o
Angle R = 180^o – 36^o
Angle R = 144^o
Then, the angle R is 144^o
Hence, the answer is (4) 144^o