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If the circle passes through the origin and has a perimeter of kπ, wha

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If the circle passes through the origin and has a perimeter of kπ, wha  [#permalink]

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New post 30 Aug 2018, 04:54
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If the circle passes through the origin and has a perimeter of kπ, what is the value of k?

(1) The center has coordinates (4,4).
(2) Area of the circle is 32π.

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Re: If the circle passes through the origin and has a perimeter of kπ, wha  [#permalink]

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New post 30 Aug 2018, 06:21
Bunuel wrote:
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If the circle passes through the origin and has a perimeter of kπ, what is the value of k?

(1) The center has coordinates (4,4).
(2) Area of the circle is 32π.

Attachment:
image020.gif


Question : If the circle passes through the origin and has a perimeter of kπ, what is the value of k?

Perimeter of circle = πD = kπ
i.e. Diameter of circle = k = ?

Statement 1:The center has coordinates (4,4).

Now we know that circle has circumference passing through origin hence distance between origin and centre is teh radius

hence radius = 4√2 i.e. Diameter = k = 8√2

SUFFICIENT

Statement 2: Area of the circle is 32π.

i.e. πr^2 = 32π

SUFFICIENT

Answer: option D
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Re: If the circle passes through the origin and has a perimeter of kπ, wha  [#permalink]

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New post 30 Aug 2018, 08:43
Bunuel wrote:
Image
If the circle passes through the origin and has a perimeter of kπ, what is the value of k?

(1) The center has coordinates (4,4).
(2) Area of the circle is 32π.


Perimeter of circle, 2πr=kπ or, r=\(\frac{k}{2}\)

Question stem:- k=?

Requirement:- radius of circle

St1:- The center has coordinates (4,4).
Radius , k/2 is the distance between center of circle (4,4) and origin(0,0)
So, k can be determined.
Sufficient

St2:- Area of the circle is 32π.
Radius of circle can be determined.
So, k can be determined.
Sufficient

Ans. (D)
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Re: If the circle passes through the origin and has a perimeter of kπ, wha &nbs [#permalink] 30 Aug 2018, 08:43
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