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Problem Solving (PS) | In the figure, find angle(DAB), given angle(DBA)=50 and angle(BCA)=70.

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EwokBanshee wrote:

I do not understand how the OA is reached. Do we have to assume that because the angles look the same in the picture that they are the same value? We are not given any details in the question.

EwokBanshee
No, don't assume values from similar appearance. :-)

The posters are relying on properties of circles and inscribed angles, about which you can read in the excellent GMATCLUB Math Book. I've linked to the particular section on circles for you, below.

The language can be very technical at
...

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