1. The angle subtended by a chord at its centre is 60°, then the ratio between chord and radius is
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By: anil on 05 May 2019 01.54 am
=> OA = OB = radii
=> $$angle$$OAB = $$angle$$OBA In $$ riangle$$ OAB, => $$angle$$OAB + $$angle$$OBA + 60 = 180 => $$angle$$OAB = $$angle$$OBA = 60 SInce, all angles are equal, => all sides will be equal too. => OAB is equilateral triangle with OA = AB => AB : OA = 1 : 1
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=> $$angle$$OAB = $$angle$$OBA In $$ riangle$$ OAB, => $$angle$$OAB + $$angle$$OBA + 60 = 180 => $$angle$$OAB = $$angle$$OBA = 60 SInce, all angles are equal, => all sides will be equal too. => OAB is equilateral triangle with OA = AB => AB : OA = 1 : 1