CMAT 2018 Solved Question Paper

Question : 20 of 100

Marks: +1, -0

The length of the minute of the watch is 42 mm. The area swept by it in 30 min (in

mm^2

) by taking π as 3.14 is

Solution:

Length of minute hand is = 42 mm
Angle by minute hand is =180°
⇒ Area swept by the minute hand in 30 min
=

{180}/{360}

x π x

r^2

{180}/{360} \;x\; {314}/{100}\; x \;42\; x\; 42

= 2769.5

mm^2

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