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If angle of arc is 60° and the length of arc is 20 cm. Find the radius of the circle from which arc is intercepted.(a) 18.08 cm(b) 17.07 cm(c) 19.09 cm(d) 18 cmThis question was addressed to me by my college director while I was bunking the class.This interesting question is from Trigonometric Functions in section Trigonometric Functions of Mathematics – Class 11 |
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Answer» CORRECT OPTION is (c) 19.09 cm To ELABORATE: 180 degree = π radian 1 degree = π/180 RADIANS 60 degrees = 60* π/180 radians = π/3 radians Angle=Arc length/Radius π/3 = 20/Radius => Radius = 60/π = 19.09 cm. |
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