Explanation:
Here < Rnp = 3x by exterior angle property of ∆RNM
Also rs|| np and rp is transversal.
So <PRS = < RPN = 78°(Alt.<s)
In ∆RNP,
3x + x + 78 = 180
=> 4x = 180-78 = 102°
So x = 102/4 = 51/2°
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