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Question

Two parallel chords of lengths 30 cm and 16 cm are drawn on the opposite sides of the centre of a circle of a radius 17 cm. The distance between the chords is

A
32cm
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B
23cm
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C
46cm
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D
16cm
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Solution

The correct option is B 23cm
GivenOisthecentreofacircleofradius17cm.AB=16cm&CD=30cmareparallelchordswhoareatperpendiculardistanceofPQ.TofindoutPQ=?SolutionWejoinOCanddropperpendicularsOM&ONfromOtoAB&CD.OM&ONmeetAB&CDatM&Nrespectively.M&NaremidpointsofAB&CDrespectivelysincetheperpendicular,droppedfromthecenterofacircletoanyofitschordbisectsthelatter.SoAM=12×AB=12×16cm=8cmandCN=12×CD=12×30cm=15cm.NowOMAB&ONCD.OMA=90o=ONC.i.eΔOMA&ΔONCarerighttriangleswithOA&OCashypotenusesrespectively.So,byPythagorastheorem,wehaveOM=OA2AM2=17282cm=15cmandON=OC2CN2=172152cm=8cm.MN=OM+ON=(15+8)cm=23cm.NowABCDandPQistheperpendiculardistancebetweenthem.AlsoOM&ONareonthesamestraightlineasbothofthemareperpediculartoapairofstraightlinesAB&CDandtheypassthroughthesamepointO.SoMNistheperpendiculardistancebetweenAB&CD.PQ=MN=23cm.AnsOptionB.
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