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What is the area of the region AOB shaded shown as above?

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Math Revolution GMAT Instructor
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What is the area of the region AOB shaded shown as above? [#permalink]

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New post 08 May 2017, 02:04
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A
B
C
D
E

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63% (00:47) correct 37% (01:07) wrong based on 68 sessions

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What is the area of the region AOB shaded shown as above?

1) \(∠AOB=120^o\)
2) \(AB=50\)
[Reveal] Spoiler: OA

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Re: What is the area of the region AOB shaded shown as above? [#permalink]

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New post 10 May 2017, 00:28
==> In the original condition, you need to find the radius of the circle and the central angle, so there are 2 variable. In order to match the number of variables to the number of equations, there must be 2 equations. Since there is 1 for con 1) and 1 for con 2), C is most likely to be the answer.
By solving con 1) and con 2), the answer is C.

Answer: C
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Re: What is the area of the region AOB shaded shown as above? [#permalink]

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New post 10 May 2017, 09:13
Can you let me know how did you solve this question.
How you come to know O is center of the circle.
I thought answer is E
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Re: What is the area of the region AOB shaded shown as above? [#permalink]

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New post 10 May 2017, 09:30
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1. Angle is 120°, however we would need the radius and something to find the area of triangle. So this statement is insufficient.
2. Length of the chord is given here, however this statement alone is insufficient.

Combining both we would get the radius and subsequently the area of triangle.

So answer should be C

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Re: What is the area of the region AOB shaded shown as above? [#permalink]

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New post 20 May 2017, 01:46
My take is E
It has to be explicitly mentioned that O is the center of the circle !!!!!!
Re: What is the area of the region AOB shaded shown as above?   [#permalink] 20 May 2017, 01:46
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What is the area of the region AOB shaded shown as above?

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