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03 Jul 2020, 04:27
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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:
15%
(low)
Question Stats:
84% (00:50) correct
16%
(01:00)
wrong
based on 38
sessions
History
Date
Time
Result
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If x units are added to the length of the radius of a circle, what is the number of units by which the circumference of the circle is increased?
A. x
B. 2
C. 2π
D. 2πx
E. x^2
A. x
B. 2
C. 2π
D. 2πx
E. x^2
03 Jul 2020, 04:30
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Initial radius = r
=> Initial circumfrence = C = 2 * pi * r
New radius = x + r
=> New circumfrence = C' = 2 * pi * (x+r)
Increase = C' - C = 2*pi*x
Answer: D
=> Initial circumfrence = C = 2 * pi * r
New radius = x + r
=> New circumfrence = C' = 2 * pi * (x+r)
Increase = C' - C = 2*pi*x
Answer: D
03 Jul 2020, 04:34
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Radius = r (before)
=> Initial circumference = 2 * pi * r
New R = x + r
=> New circumference = 2 pi r + 2 pi x
Increase = 2 pi x
D is the answer
=> Initial circumference = 2 * pi * r
New R = x + r
=> New circumference = 2 pi r + 2 pi x
Increase = 2 pi x
D is the answer
