यदि AB||CD, कोणAPQ= 50° और कोण PRD = 127° है तो X और Y ज्ञात कीजिए
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x = ∠APQ = 50° [ एकान्तर कोण ]
∠APQ + y = ∠PRD = 127° [ एकान्तर कोण ]
5° + y = 127°
y = 127° - 50° = 77°
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