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Geometry Level 2

Let ACAC be a line segment in the plane and BB a point between AA and CC. Construct an isosceles triangle PABPAB and QBCQBC on one side of the segment ACAC such that APB=BQC=120\angle APB= \angle BQC=120^\circ and an isosceles triangle RACRAC on the other side of ACAC such that ARC=120\angle ARC=120^\circ. Find the measure of PRQ\angle PRQ in degrees.

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