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In the xy-plane above, is angle BAC greater than 90 degrees?

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Senior RC Moderator
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In the xy-plane above, is angle BAC greater than 90 degrees?  [#permalink]

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New post 05 Mar 2017, 03:00
1
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A
B
C
D
E

Difficulty:

  25% (medium)

Question Stats:

85% (01:35) correct 15% (01:49) wrong based on 40 sessions

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In the xy-plane above, is angle BAC greater than 90 degrees?

(1) Points A and B have different x-coordinates.
(2) The measure of angle B is twice the measure of angle C.

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Re: In the xy-plane above, is angle BAC greater than 90 degrees?  [#permalink]

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New post 05 Mar 2017, 03:43
If a and b have diff coordinates then it may be more than 90 degrees or less than 90 degrees. So 1st option is ruled out.

If angle b is twice is of angle c then also you can't be sure of more than 90 degrees.

Combining two options will not give any more info. So E is the answer
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Re: In the xy-plane above, is angle BAC greater than 90 degrees?  [#permalink]

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New post 01 Aug 2017, 00:34
In what case would the angle be greater than 90 degrees?? I mean what should be the values of the co ordinates for it to be greater than 90 degree, Also what should the co-ordinates be for the angle formed to be 90 degrees??
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Re: In the xy-plane above, is angle BAC greater than 90 degrees?   [#permalink] 01 Aug 2017, 00:34
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In the xy-plane above, is angle BAC greater than 90 degrees?

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