Mensuration Practice Test 10

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Question : 18 of 40

Marks: +1, -0

Find the length of a rope by which a dog must be tethered so that it may be able to guard an area of 2,464

m^2

.

28 m
38 m
22 m
26 m

Solution:

Area to be guarded = 2,464

m^2

πr^2

= 2,464

{22}/7× r^2

= 2464
r =

√{{2464×7}/{22}}

r =

√{784}

r = 28 m

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