Question
A circular clock has the hour hand of length 42 cm. Find
the length of the distance it covers by its tip from 11 p.m. to 3 a.m.Solution
Length of hour hand = 42 cm In 12 hours, hour hand completes one revolution. In 4 hours, hour hand complete (1/3) revolution. Distance covered by hour hand from 11 p.m. to 3 a.m. =1/3 Γ Ο r Β²Β = 1/3 Γ 22/7Γ42Γ42 =22Γ84=1848cm
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