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CATPREP - circle vs. triangle

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Source: — Data Sufficiency |
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by bec.amit » Sun Mar 29, 2009 3:18 pm
OA C:

angle ACB=120 degree
angle AEB=60 as angle at center =2 x angle at circumference
so AEB is a equilateral triangle.

if AB is known as ABE is equilateral we can calulate the permiter
=AB+AE+BE = 6
so both A n B are essential

so OA C:
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