Using a ruler and a pair of compasses only construct triangle ABC such that AB=8cm,angle ABC=60 degree

Using a ruler and a pair of compasses only construct triangle ABC such that AB=8cm,angle ABC=60degree and angle BAC =75degree,Locate the point O inside triangle ABC equidistant from A,B and C. Construct the circle with center O, which passes through A.Measure OA and angle ACD.

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