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Angle measure - D

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Source: — Data Sufficiency |
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by Bharat » Sun Sep 02, 2007 11:32 am
Focus on the triangle ACO & use the following property:
Extrenal Angle = sum of the other two angles

External Angle COD = Angle OAC + Angle ACO

& Angle BAO = Angle OAC

Thus using both of the statements, you can get that desired angle is 20 (= 60 - 40) degrees.

Hence answer is D
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by jayhawk2001 » Sun Sep 02, 2007 4:10 pm
Answer is D

Please check out https://www.beatthegmat.com/viewtopic.php?t=2770
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