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by sanju09 » Mon Feb 09, 2009 4:50 am
A circle with center O is made to pass through the four vertices of a quadrilateral ABCD. What is the measure of angle AOD?

(1) Angles ABC and BCD are supplementary.
(2) Angle BAC measures 30º.

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by billzhao » Mon Feb 09, 2009 5:54 am
The answer is C.

(1) -> AB // CD, which alone is not sufficient
(2) -> LACD = LBAC = 30 degree -> LAOD=60 degree
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by sanju09 » Mon Aug 02, 2010 5:23 am
billzhao wrote:The answer is C.

(1) -> AB // CD, which alone is not sufficient
(2) -> LACD = LBAC = 30 degree -> LAOD=60 degree
Can anyone explain billzhao's take in detail, please?
The mind is everything. What you think you become. -Lord Buddha



Sanjeev K Saxena
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The Princeton Review - Manya Abroad
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by sanju09 » Mon Aug 02, 2010 5:24 am
sanju09 wrote:
billzhao wrote:The answer is C.

(1) -> AB // CD, which alone is not sufficient
(2) -> LACD = LBAC = 30 degree -> LAOD=60 degree
Can anyone explain billzhao's take in detail, please? MBM means made by me for www.avenuesabroad.org
The mind is everything. What you think you become. -Lord Buddha



Sanjeev K Saxena
Quantitative Instructor
The Princeton Review - Manya Abroad
Lucknow-226001

www.manyagroup.com
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