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What is the difference in perimeter between two sectors each lying in

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What is the difference in perimeter between two sectors each lying in  [#permalink]

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New post 09 Sep 2018, 07:50
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A
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C
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E

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  55% (hard)

Question Stats:

59% (00:54) correct 41% (01:04) wrong based on 29 sessions

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What is the difference in perimeter between two sectors each lying in a different circle?

(1) The difference in radius between the two circles is 2.
(2) The measure of the central angle of each sector is 30 degrees.

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Re: What is the difference in perimeter between two sectors each lying in  [#permalink]

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New post 09 Sep 2018, 15:56
Perimeter of sector is r(2+angle)
Delta of sector perimeter of two circles. p1-p2
St. 1
r1-r2= 2
Angle is not given. Therefore, insufficient.

St. 2
Angle of both sectors is 30 degree.
Radius is not given.
Not sufficient.

St1+ st2
radius and angle both are given so sufficient.

C is answer.
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What is the difference in perimeter between two sectors each lying in  [#permalink]

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New post 10 Sep 2018, 10:16
gvij2017 wrote:
Perimeter of sector is r(2+angle)
Delta of sector perimeter of two circles. p1-p2
St. 1
r1-r2= 2
Angle is not given. Therefore, insufficient.

St. 2
Angle of both sectors is 30 degree.
Radius is not given.
Not sufficient.

St1+ st2
radius and angle both are given so sufficient.

C is answer.


Hi I don't get it, we dont have the radius, we just have the difference between the two radius.
From st1 and 2 I built the following equation : 30/360π2R - 30/360π2R-2 (which cannot be solved)
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What is the difference in perimeter between two sectors each lying in &nbs [#permalink] 10 Sep 2018, 10:16
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