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29 Oct 2017, 01:17
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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:
25%
(medium)
Question Stats:
73% (01:24) correct
27%
(01:07)
wrong
based on 146
sessions
History
Date
Time
Result
Not Attempted Yet
If the radius of a circle is increased by 6%, then the area of the circle is increased by
(A) .36%
(B) 3.6%
(C) 6%
(D) 12.36%
(E) 36%
(A) .36%
(B) 3.6%
(C) 6%
(D) 12.36%
(E) 36%
29 Oct 2017, 08:44
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Bunuel
Area of the Circle = \(πr^2\)
So, Percentage change in area of the Circle is 6 + 6 +6*6/100 = 12.36%
Thus, correct answer will be (D) 12.36%
29 Oct 2017, 21:11
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Bunuel
Increase in area =
((scale factor)\(^2\) - 1) * 100
6 percent increase = 1.06 scale factor
(1.06)\(^2\) = 1.1236
(1.1236 - 1) * 100 =
(.1236 * 100) = 12.36 percent
Answer D
