A circle can have ______ parallel tangents at the most.
A
two
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B
zero
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C
four
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D
Infinite number of a set of
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Solution
The correct option is D Infinite number of a set of LetAB&CDbetwoparalleltangentstoacirclewithcentreOatP&Qrespectively.ThenPQisadiameterofthecirclesinceOP⊥AB&OQ⊥CD.(theradius,passingthroughthepointofcontactofatangenttoacircle,isperpendiculartothetangent).Butthereareinfinitenumberofdiametersofacircle.Sothereareinfinitenumberofasetoftwoparalleltangentstoacircle.Ans−OptionD.