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Math Park in Grade Three! ! ! ! ! ! 10! ! ! ! ! ! Ok, extra points! ! Right now! ! ! ! ! !
Still have some imagination! ! !

~~~BC is tangent to arc AC at point C.

Triangle OBC is a right triangle.

Firstly, calculate the angle BOC, and then use COSine cos (angle BOC)=OC/BO to get OB.

AB=OB-0A

~~

Angle BOC = [AC/(2 * 3.14 * oc)] * 360.

Move your hand.

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