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If the diameter of the circle is 36, what is the length of arc ABC?

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If the diameter of the circle is 36, what is the length of arc ABC?  [#permalink]

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New post 19 Sep 2018, 21:53
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If the diameter of the circle is 36, what is the length of arc ABC?


(A) \(8\)

(B) \(8\pi\)

(C) \(28\pi\)

(D) \(32\pi\)

(E) \(56\pi\)

Attachment:
Capture.JPG
Capture.JPG [ 21.87 KiB | Viewed 786 times ]

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If the diameter of the circle is 36, what is the length of arc ABC?  [#permalink]

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New post 19 Sep 2018, 23:17
Circumference of Circle= 2\(\pi\)r= 36\(\pi\)

Length of minor arc AC= \(\frac{80}{360}\)*36\(\pi\)= 8\(\pi\)

Length of arc ABC= 36\(\pi\)-8\(\pi\)= 28\(\pi\)

Answer: C.
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Re: If the diameter of the circle is 36, what is the length of arc ABC?  [#permalink]

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New post 19 Sep 2018, 22:09
80/360 * 36π

My guess would be B.
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If the diameter of the circle is 36, what is the length of arc ABC?  [#permalink]

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New post Updated on: 18 Oct 2018, 04:22
Bunuel wrote:
Image
If the diameter of the circle is 36, what is the length of arc ABC?


(A) \(8\)

(B) \(8\pi\)

(C) \(28\pi\)

(D) \(32\pi\)

(E) \(56\pi\)

Attachment:
The attachment Capture.JPG is no longer available


Diameter = 36
i.e. radius = 36/2 = 18

Refer to Property attached in Image 1 which says that angle at the circumference is Half of the angle at the centre drawn by the same arc

Refer to image 2, If angle at circumference = 40 then angle at centre = 2*40 = 80º

Now, Length of Minor Arc AC \(= (Angle at centre/360)*2πr = (80º/360º)*2*π*18 = 8π\)

Total Circumference \(= 36π\)

i.e. Major Arc ABC\(= 36π-8π = 28π\)


Answer:Option C
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File comment: Angle at centre will be 2*40 = 80
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File comment: www.GMATinsight.com
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1.jpg [ 12.36 KiB | Viewed 588 times ]


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Originally posted by GMATinsight on 20 Sep 2018, 04:16.
Last edited by GMATinsight on 18 Oct 2018, 04:22, edited 1 time in total.
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Re: If the diameter of the circle is 36, what is the length of arc ABC?  [#permalink]

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New post 17 Oct 2018, 08:24
Bunuel Hi Bunuel, how do we know for sure which Arc is the question asking to calculate? I was confused between minor and major arc, because saying arc ABC it can refer to both in my opinion. THank you
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Re: If the diameter of the circle is 36, what is the length of arc ABC?  [#permalink]

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New post 18 Oct 2018, 04:20
VodkaHelps wrote:
Bunuel Hi Bunuel, how do we know for sure which Arc is the question asking to calculate? I was confused between minor and major arc, because saying arc ABC it can refer to both in my opinion. THank you



Length fo Arc ABC can be understood in only one way like it has been interpreted here.

Always identify the arc by reading the points in that particular order.

Arc AC could have caused two interpretations which you intend to bring here but when we say are ABC then it's only the major arc that is being referred.

I hope this helps!!!
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Re: If the diameter of the circle is 36, what is the length of arc ABC? &nbs [#permalink] 18 Oct 2018, 04:20
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