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# Points A,B,C and D are distinct points lying on a circle

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CEO
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Points A,B,C and D are distinct points lying on a circle [#permalink]  21 Jul 2006, 14:26
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Question Stats:

0% (00:00) correct 100% (00:33) wrong based on 2 sessions
Points A,B,C and D are distinct points lying on a circle with centre O, as shown. What is the degree measure of angle DOC?

1. Angle AOB = 70 degree
2. Angle AEB = 120 degree
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Circle.JPG [ 7.38 KiB | Viewed 1102 times ]

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SAID BUSINESS SCHOOL, OXFORD - MBA CLASS OF 2008

Manager
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Easy C.

We dont have to really find the angle in question but just know that the locations of all points of the circumference can be defined by 1 and 2 combined.

First statement fixes points A and B. Statement 2 fixes points C and D for a unique location of all four points.

Nice question.
CEO
Joined: 20 Nov 2005
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Schools: Completed at SAID BUSINESS SCHOOL, OXFORD - Class of 2008
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rbcola wrote:
Easy C.

We dont have to really find the angle in question but just know that the locations of all points of the circumference can be defined by 1 and 2 combined.

First statement fixes points A and B. Statement 2 fixes points C and D for a unique location of all four points.

Nice question.

Could you tell me the degree measure? Its not all about the answer. Its about learning new concepts.
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SAID BUSINESS SCHOOL, OXFORD - MBA CLASS OF 2008

Last edited by ps_dahiya on 21 Jul 2006, 15:14, edited 1 time in total.
GMAT Instructor
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Great question! We should write a book together...
Manager
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OK.

angle DOC = 170

Arc AB = 70 degrees

Angle DEC = (Arc AB + Arc DC)/2

Solving for Arc DC we get 170

Therefore angle DOC = 170 degrees
Director
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Can someone please point out a resource that teaches this concept?
Manager
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Futuristic wrote:
Can someone please point out a resource that teaches this concept?

I second that - ps_dahiya, do you know any resource that explains this concept, and other similar concepts.
CEO
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Schools: Completed at SAID BUSINESS SCHOOL, OXFORD - Class of 2008
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xsports wrote:
Futuristic wrote:
Can someone please point out a resource that teaches this concept?

I second that - ps_dahiya, do you know any resource that explains this concept, and other similar concepts.

http://regentsprep.org/Regents/mathb/5A ... Angles.htm

All these links were psoted by giddi77.

http://www.saltire.com/applets/equangle/equangle.htm
http://library.thinkquest.org/20991/geo/index.html
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Manager
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ps_dahiya wrote:
xsports wrote:
Futuristic wrote:
Can someone please point out a resource that teaches this concept?

I second that - ps_dahiya, do you know any resource that explains this concept, and other similar concepts.

http://regentsprep.org/Regents/mathb/5A ... Angles.htm

All these links were psoted by giddi77.

http://www.saltire.com/applets/equangle/equangle.htm
http://library.thinkquest.org/20991/geo/index.html

Cheers matey. You are a star.
Whereabouts in India are you from?
Intern
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Re: DS: Circle Angles [#permalink]  05 Nov 2011, 07:02
I don't quite understand this answer. Can someone explain this clearly please?
Re: DS: Circle Angles   [#permalink] 05 Nov 2011, 07:02
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