ANSWER∠PQR+ext.∠Q=180∘ [LINEAR PAIR]∠PQR+80∘=180∘⇒∠PQR=100∘ x+100∘=180∘ [SUPPLEMENTARY angles of PARALLELOGRAM] x=80∘In △PSR,Z=∠SRP [Alternate angles]∴80∘+60∘+Z=180∘⇒Z=180∘−140∘=40∘In △PQR,40∘+y+100∘=80∘ y=180∘−140∘=40∘
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