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pls discuss !! 4.doc

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Senior Manager
Joined: 08 Nov 2008
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18 May 2009, 22:22
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pls discuss !!
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4.doc [81.5 KiB]

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Re: DS 3 - gmatprep  [#permalink]

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18 May 2009, 23:53
since O is the center and ab=oc, you know that abo is an isoceles triangle and angle bao=boa

1. cod=60 degrees so coa=120 degrees, also triangle cbo is a 90 degree triangle because its inscribed in a semicircle. boa=120-90=30 so bao=30 also

2.bco=40, cob=90 so cbo=50 therefore ab0=130 and boa and bao= 25 (why they are not 30 as in statement 1, i dont know, perhaps i made a mistake somewhere
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Re: DS 3 - gmatprep  [#permalink]

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19 May 2009, 00:05
are u sure of this rule - any triangle inscribed in semicircle will be right angle triangle ??
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Re: DS 3 - gmatprep  [#permalink]

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19 May 2009, 00:20
tenaman10 wrote:
are u sure of this rule - any triangle inscribed in semicircle will be right angle triangle ??

yup

http://www.algebra.com/algebra/homework ... .wikipedia

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If you would like to discuss this question please re-post it in the respective forum. Thank you!

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Re: DS 3 - gmatprep &nbs [#permalink] 19 May 2009, 00:20
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