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12 Nov 2020, 01:15
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D
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
5%
(low)
Question Stats:
97% (00:53) correct
3%
(01:22)
wrong
based on 65
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The following figure shows concentric circles. What is the area of the shaded region?
A. \(6\pi\)
B. \(8\pi\)
C. \(12\pi\)
D. \(16\pi\)
E. \(32\pi\)
Attachment:
2020-10-27_13-51-48.png [ 32.66 KiB | Viewed 2102 times ]
yashikaaggarwal
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12 Nov 2020, 02:53
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Diameter of bigger circle = 6+2+2 = 10
Radius of bigger circle = 5
Area of bigger circle = πr^2
=> π*5^2
=> 25π
Diameter of smaller circle = 6
Radius of smaller circle = 3
Area of bigger circle = πr^2
=> π*3^2
=> 9π
Area of shaded region = Area of bigger circle - Area of smaller circle
=> 25π-9π
=> 16π
Answer is D
Posted from my mobile device
Radius of bigger circle = 5
Area of bigger circle = πr^2
=> π*5^2
=> 25π
Diameter of smaller circle = 6
Radius of smaller circle = 3
Area of bigger circle = πr^2
=> π*3^2
=> 9π
Area of shaded region = Area of bigger circle - Area of smaller circle
=> 25π-9π
=> 16π
Answer is D
Posted from my mobile device
12 Nov 2020, 07:25
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Bunuel
large circle d=6+2+2=10, r=5, ar=25pi
small circle d=6, r=3, ar=9pi
larg-smal area=25-9pi=16pi
(D)
