FUNCTION: cpFloat cpMomentForCircle ( cpFloat m, cpFloat r1, cpFloat r2, cpVect offset ) ;
FUNCTION: cpFloat cpMomentForSegment ( cpFloat m, cpVect a, cpVect b ) ;
FUNCTION: cpFloat cpMomentForPoly ( cpFloat m, int numVerts, cpVect* verts, cpVect offset ) ;
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