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If minute hand covers 24 cm length in 30 minutes, then how much length minute hand have?(a) 19.1 cm(b) 38.2 cm(c) 57.3 cm(d) 45 cmI got this question during a job interview.The doubt is from Trigonometric Functions topic in chapter Trigonometric Functions of Mathematics – Class 11

Answer»

Right option is (b) 38.2 cm

The best I can EXPLAIN: In 60 minutes, ANGLE covered by MINUTE hand is 360°.

In 30 minutes, angle covered by minute hand is 180°.

L=24 cm, θ=180°=π

θ=L/r => π=24/r => r=24/π = 38.2 cm.



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