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Question

In the given figure 'O' is the centre of the circle and AB , CD are equal to chords .If<AOB=70ok.Find the angles of OCD.
709151_48613130771b447b9ef703aab929f76c.png

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Solution

From the given figure
InΔAOBandΔCODOA=OD[bothareradius]OB=OC[bothareradius]AB=DC[Chordareequal]ΔAOBΔCOD(byssscongruent)AOB=COD=70NowInΔOCDOC=OD(bothareradius)then,ODC=OCD=x(Let)sumofangleofΔ=180x+x+70=1802x=18070x=1102HenceODC=55OCD=55COD=70

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