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Question

In the figure both RISK and CLUE are parallelograms. Find the value of x in degrees.
301402_2479db21b58946f2a682192094ce28c2.png

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Solution

IntheparallelogramRISK,wehaveRlS=RKS=120[opp.anglesofparallelogramareequal)

Also,OIC=180RlS[Linearpairofangles)OIC=180120=60......(1)
IntheparallelogramCLUE,CELUandatransversalCLintersectsthem.ICO=CLU[Correspondinganglesareequal)ICO=70......(2)
InOIC,byanglesumproperty,wehaveIOC+OIC+ICO=180[From(1)and(2)]ICO+60+70=180IOC=1806070=50.x=IOC=50o[Verticallyoppositeanglesareequal)

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