Example image of eyePlorer eyePlorer map for 'Circle': Centre (geometry) Euclidean geometry Plane (geometry) Point (geometry) Shape Radius Curve Interior (topology) Perimeter Disk (mathematics) Circumference Ellipse Focus (geometry) Conic section Conical surface Diameter Endpoint Chord (geometry) Tangent Secant line Arc (geometry) Connected space Circular sector Circular segment Gear Wheel Astrology and astronomy Geometry Science Science in the Middle Ages Rhind Mathematical Papyrus Euclid's Elements Ferdinand von Lindemann Squaring the circle Mathematical constant Area of a disk Circumscribed circle Calculus of variations Isoperimetric inequality Cartesian coordinate system Equation Parametric equation Pythagorean theorem Trigonometric functions Homogeneous coordinates Circular points at infinity Polar coordinate system Complex plane Generalised circle Line (geometry)