A wall clock has its minute hand of length 21 cm. What area will it swept in covering 30 minutes?

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08 Dec 2020 Area A wall clock has its minute hand of length 21 cm. What area will it swept in covering 30 minutes?: OPtion
1) 545 cm^2
2) 637 cm^2
3) 742 cm^2
4) 693 cm^2
5) 540 cm^2
6) 620 cm^2
7) 342 cm^2
8) 603 cm^2
9) 303 cm^2
10) None of the above; Correct Option: 4 Best Solution (3)

G.S.Kantharao 3 years AGO

Area=180°(πr^2)/360°
=22*21^2/2*7=441*22/2*7
=63*11=693cm^2
My option is 4👈

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Varun 3 years AGO

Area of circle = pi r r
30 minutes = Half circle
=> 22/7 *21*21 /2= 693cm^2

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Eakcha Shah 3 years AGO

30 minutes =180 angle
mean 1/2 of clock area

then πr^2/2
r=21
πr^2 =1386
πr^2/2=693 cm^2

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Dimple

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Punjab

Time: 00:01:33

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A wall clock has its minute hand of length 21 cm. What area will it swept in covering 30 minutes?

M4maths Previous Puzzles

08 Dec 2020 Area