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# What is the approximate distance around the outer edge of a circular

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Math Expert
Joined: 02 Sep 2009
Posts: 50572
What is the approximate distance around the outer edge of a circular  [#permalink]

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11 Sep 2018, 23:23
00:00

Difficulty:

35% (medium)

Question Stats:

64% (01:01) correct 36% (02:13) wrong based on 11 sessions

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What is the approximate distance around the outer edge of a circular track with an area of 145 square feet?

A. 46 feet
B. 42 feet
C. 36 feet
D. 24 feet
E. 21 feet

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Director
Status: Learning stage
Joined: 01 Oct 2017
Posts: 930
WE: Supply Chain Management (Energy and Utilities)
Re: What is the approximate distance around the outer edge of a circular  [#permalink]

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12 Sep 2018, 02:16
Bunuel wrote:
What is the approximate distance around the outer edge of a circular track with an area of 145 square feet?

A. 46 feet
B. 42 feet
C. 36 feet
D. 24 feet
E. 21 feet

Given $$\pi*r^2=145$$ or, $$r=\sqrt{\frac{145}{\pi}}$$=7(approx.) [144/3=48, $$\sqrt{49}=7$$]

To find:- distance around the outer edge of a circular track=$$2*\pi*r$$=2*3*7=42

Ans. (B)
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PKN

Rise above the storm, you will find the sunshine

Re: What is the approximate distance around the outer edge of a circular &nbs [#permalink] 12 Sep 2018, 02:16
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# What is the approximate distance around the outer edge of a circular

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