The length of the minute hand of a clock is 21 cm. The are swept by the minute hand in 10 minutes is

Options

A. `231cm^(2)`
B. `210cm^(2)`
C. `126cm^(2)`
D. `252cm^(2)`

Answer

A

Explanation

Area swept by minute hand in 60 minutes `=piR^(2)`
Area swept by it in 10 minutes
`=((piR^(2))/60xx10)cm^(2)=(22/7xx21xx21xx1/6)cm^(2)`
`=231cm^(2)`