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If the circumference of circle P is 15.174 and the circumference of

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If the circumference of circle P is 15.174 and the circumference of [#permalink]

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New post 14 Nov 2017, 22:42
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If the circumference of circle P is 15.174 and the circumference of circle Q is 6.28, then the diameter of circle P minus the diameter of circle Q is approximately equal to

(A) 1.5
(B) 3.0
(C) 5.5
(D) 9.0
(E) 9.4
[Reveal] Spoiler: OA

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Re: If the circumference of circle P is 15.174 and the circumference of [#permalink]

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New post 14 Nov 2017, 23:48
P-Q=15,174/6,28 - 6,28/6,28~(15-6)/6~1,5
Answer A
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Re: If the circumference of circle P is 15.174 and the circumference of [#permalink]

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New post 15 Nov 2017, 00:08
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Bunuel wrote:
If the circumference of circle P is 15.174 and the circumference of circle Q is 6.28, then the diameter of circle P minus the diameter of circle Q is approximately equal to

(A) 1.5
(B) 3.0
(C) 5.5
(D) 9.0
(E) 9.4


Let x be the radius of the circle P and y the radius of the circle Q.

2 * Pi * x = 15.174
2 * Pi * y = 6.28

2x - 2y = 1/Pi * (15.174 - 6.28) = 8.894/3.14 which is approximately 3

Therefore, the difference in diameters of both the circle is 3.0(Option B)
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Re: If the circumference of circle P is 15.174 and the circumference of [#permalink]

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New post 15 Nov 2017, 00:24
pushpitkc wrote:
Bunuel wrote:
If the circumference of circle P is 15.174 and the circumference of circle Q is 6.28, then the diameter of circle P minus the diameter of circle Q is approximately equal to

(A) 1.5
(B) 3.0
(C) 5.5
(D) 9.0
(E) 9.4


Let x be the radius of the circle P and y the radius of the circle Q.

2 * Pi * x = 15.174
2 * Pi * y = 6.28

2x - 2y = 1/Pi * (15.174 - 6.28) = 8.894/3.14 which is approximately 3

Therefore, the difference in diameters of both the circle is 3.0(Option B)


You're correct. I've messed up with radius and diameter :grin:
Re: If the circumference of circle P is 15.174 and the circumference of   [#permalink] 15 Nov 2017, 00:24
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