- circlea clock(2)measurements in a circlethe triangle inequalitythe lunes of Alhazenthe lune of Hippocratestangent at a pointtangent lines to a circleThales' theoremtangent-chord anglesquare roots in a greek way...the golden ratio (and aphrodite's phi)geometric constructions - 2angles in a circle...archimedes' arbelosmedian to the hypotenuseinscribed quadrilateralsptolemy's theoremspower of a pointthe relative position of two circlescentral and inscribed anglesa circle (equation)regular polygonssimson linenine-point circleincircle and excircles of a triangleregular polygons-1an archimedes' formulaarea of a circlearea of a circle-1radiansequal chordsan isosceles triangle...find the anglesfind the anglean equilateral trianglea Reuleaux trianglethe witch of agnesithe cissoid of dioclesdeltoidastroidnephroidranunculoidconchoid of nicomedeslimacon of pascalcycloidsconchoid of a circlepiriformdivision of a segmentan apollonian circleellipse as a hypotrochoidellipses and hyperbolaseight curve (construction)radical axis-1radical axis-2law of sines (proof)archimedes' twin circlesroots of the quadratic equationarchimedes' "salinon"the flower of lifethe seed of lifeyin-yangJohnson's theoremconstruction of a triangle (sss)miquel's triangle theoremproof of pythagorean-5hippias' quadratrixangle trisectionfirst brocard pointnagel pointgergonne pointrolling circle squares itselfgeometric-arithmetic mean inequalitylaw of cosines (pww)chords and tangentsregular star polygonssquaring a rectanglepitot theoremangle between secantstangents to a circlea clockgolden ratio-3equal chords-1the golden ratio and aphrodite's phiregular polygonsangles in a circle...aristotle's wheel paradoxparallel chords theoremsecant-secant theoremtangent-secant theoremtrigonometry_unit circleareas-3area of a triangle-2circle and ellipseХристос Bоскресе!circle-1f(x)=q+sqrt(r^2-(x-p)^2)basic trig numbers-2basic trig numbers-1rolling coin paradoxfeuerbach's pointarc length (verification)tangent-chord angle-1tangent to a circlepentalphaproperties of the altitudescommon external tangentscommon internal tangentscommon external tangents-1common internal tangents-1approximating pi-1a clock-3proof of pythagorean-9circles of a regular n-gonArea of Circles (3)Rolling Coin 滾動的硬幣 (1)Seven Circles Theoremcircumference of circles-1ferris wheelnewton's diska wheel of fortune-1conway circleregular polygons-3
