- CirclesEquation & Graph of a CircleEquation of Circles (General)Equation of Circles (Standard)GeoGebra 4.4 Example: exact intersection of line and circleIntersection of a line and circle.Intersection of a Circle and a LineEquations of CirclesEquation of a circle - Test fileThe equation of a tangent to a circleCircle intersect with Straight LineWeek 6 - Intersections between a circle and a lineintersect of line and circleSpherical Lines: Great Circlespoint of intersection between a line and a circleCicle and line