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The outer figure above is a rectangle with four rounded corn
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22 Jul 2020, 10:39
22 Jul 2020, 10:39
Expert Reply
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Question Stats:
67% (01:12) correct
32% (01:37) wrong based on 64 sessions
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Attachment:
GRE rectangle with a circle.jpg [ 22.66 KiB | Viewed 2344 times ]
The outer figure above is a rectangle with four rounded corners of radius equal to 2. The inner figure is a circle.
Quantity A |
Quantity B |
The shaded area |
30 |
A)The quantity in Column A is greater.
B)The quantity in Column B is greater.
C)The two quantities are equal.
D)The relationship cannot be determined from the information given.
The outer figure above is a rectangle with four rounded corn
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17 Dec 2022, 12:29
17 Dec 2022, 12:29
1
Seeing this problem on first glance, my intuition told me that the answer was D. However, on the GRE it is best not to blindly trust our intuition; we should test our assumptions.
If figure was rectangle, then the area would be: 6 x 10 = 60. However, as the edges are rounded we must subtract them from the total:
rounded edges.png [ 60.71 KiB | Viewed 1240 times ]
So the rectangular figure has an approximate area of 60 - (16 - 4 pi ) = 56.566.
From here, we must subtract the area of the circle contained in the figure in order to determine the area of the shaded portion of the figure. As the figure is not drawn to scale, this will be a range of values.
GRE rectangle with a circle-1.jpg [ 11.74 KiB | Viewed 1279 times ]
As the radius of the circle is not specified, it could theoretically be an infinitesimally small. Take for example a circle with a radius of 0.01. The area of the circle would be: (0.01)^2 pi = 0.0003. Even this value subtracted from the area of the rectangular figure would be negligible. Thus, we can say that the Area Max = 56.566
To find the minimum area of the shaded portion of the figure, we set the area of the inner circle to it's maximum value:
Inner circle max.png [ 29.77 KiB | Viewed 1260 times ]
Subtracting this value from the area of the rectangular figure we can find the minimum area:
56.566 - 3 pi = 28.292 ----> Area min = 28.292
28.292 < QA < 56.566
QB = 30
As QB falls within QA's range, we can confirm that Answer Choice D is correct.
If figure was rectangle, then the area would be: 6 x 10 = 60. However, as the edges are rounded we must subtract them from the total:
Attachment:
rounded edges.png [ 60.71 KiB | Viewed 1240 times ]
So the rectangular figure has an approximate area of 60 - (16 - 4 pi ) = 56.566.
From here, we must subtract the area of the circle contained in the figure in order to determine the area of the shaded portion of the figure. As the figure is not drawn to scale, this will be a range of values.
Attachment:
GRE rectangle with a circle-1.jpg [ 11.74 KiB | Viewed 1279 times ]
As the radius of the circle is not specified, it could theoretically be an infinitesimally small. Take for example a circle with a radius of 0.01. The area of the circle would be: (0.01)^2 pi = 0.0003. Even this value subtracted from the area of the rectangular figure would be negligible. Thus, we can say that the Area Max = 56.566
To find the minimum area of the shaded portion of the figure, we set the area of the inner circle to it's maximum value:
Attachment:
Inner circle max.png [ 29.77 KiB | Viewed 1260 times ]
Subtracting this value from the area of the rectangular figure we can find the minimum area:
56.566 - 3 pi = 28.292 ----> Area min = 28.292
28.292 < QA < 56.566
QB = 30
As QB falls within QA's range, we can confirm that Answer Choice D is correct.
General Discussion
Re: The outer figure above is a rectangle with four rounded corn
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22 Jul 2020, 22:56
22 Jul 2020, 22:56
1
OA is missing sir !
