By the Intersection of Line and Circle
General syntax is
P1=POINT/XSMALL,INTOF,LN1,CIR1
P2=POINT/XLARGE,INTOF,LN1,CIR1
P3=POINT/XSMALL,INTOF,LN2,CIR1
P4=POINT/YSMALL,INTOF,LN2,CIR1
The modifiers XSMALL, XLARGE, etc. one of which is to be used, signify the point, which has algebraically small or large co-ordinate when projected onto that axis.