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Ask a difficult math problem, how to do the 20 13 Yibin senior high school entrance examination 2 1 math problem? The topic is about the height measurement of Daguanlou.
I guess your picture should be this.

You asked the distance of oc, so

Settings; The AO distance is X.

BA= 12 AO=X？ BO should be equal to ba+bo =12+x.

The triangle OBC is an isosceles triangle.

OC=BO= 12+X

Pythagorean theorem shows that OC=√3OA=√3X.

The equation listed is 12+X=√3X.

The solution is X= 17.

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