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.
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 × π r ² = 1/3 × 22/7×42×42 =22×84=1848cm
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