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16 Nov 2017, 08:27
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E
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
25%
(medium)
Question Stats:
73% (01:11) correct
27%
(01:05)
wrong
based on 44
sessions
History
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Time
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Not Attempted Yet
A pilot surveys a flat circular area represented by 4π square inches on a map. If 1 inch on the map represents 60 miles, how many square miles does the pilot survey?
(A) 15π
(B) 240π
(C) 900π
(D) 7,200π
(E) 14,400π
(A) 15π
(B) 240π
(C) 900π
(D) 7,200π
(E) 14,400π
16 Nov 2017, 09:06
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Answer is E here.
We know its a circular area represented by 4pi square inches. Area of a circle is Pi*r^2. So R is = 2 inches.
Given the information we know that 1inch = 60 miles so the area of the circle in terms of miles is ((2*60)^2) * pi.
From there it's just some quick math to get to 14,400 pi.
We know its a circular area represented by 4pi square inches. Area of a circle is Pi*r^2. So R is = 2 inches.
Given the information we know that 1inch = 60 miles so the area of the circle in terms of miles is ((2*60)^2) * pi.
From there it's just some quick math to get to 14,400 pi.
16 Nov 2017, 09:29
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Bunuel
\(πr^2 = 4π\)
So, \(r = 2 inch\)
Actual radius on map = 120 miles, so actual area on land is \(120^2π\) = \(14,400π\) , Answer will be (E)
