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14 Sep 2024, 12:18
Kudos
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Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
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Question Stats:
75% (00:46) correct
25% (04:04) wrong based on 4 sessions
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In the fIgure above, if the square inscribed in the circle has an area of 16, what is the area of the shaded region?
A. 2π - 1
B. 2π - 4
C. 4π - 2
D. 4π - 4
E. 8π - 4
Attachment:
11.jpg [ 9.61 KiB | Viewed 598 times ]
26 Oct 2024, 12:21
Kudos
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Donnie84
OE
It is clear from the fgure that the area of the shaded region is 1/4 of the difference between the area of the circle and the area of the square. You are given that the area of the square is 16, so each side has length 4.
You can fnd the area of the circle if you know the radius of the circle. If you draw a diagonal of the square, as shown in the fgure below, you can see that the diagonal is also a diameter of the circle.
Note that the diagonal divides the square into two isosceles right triangles with legs of length 4. By the Pythagorean theorem applied to one of the right triangles, the length of the diagonal is equal \(\sqrt{4^2+4^2}\) to or \(4 \sqrt{2}\). Thus the radius of the circle is r=\(\frac{4\sqrt{2}}{2}\) and the area of the circle is \(πr^2 = π(2\sqrt{2})^2 = 8π.\) Terefore the area of the shaded region is \(\frac{8π -16}{4}\) or \(2π - 4\). The correct answer is Choice B.
Attachment:
2.jpg [ 16.6 KiB | Viewed 463 times ]
