- 시계
- a clock(2)
- measurements in a circle
- the triangle inequality
- the lunes of Alhazen
- the lune of Hippocrates
- tangent at a point
- tangent lines to a circle
- Thales' theorem
- tangent-chord angle
- square roots in a greek way...
- the golden ratio (and aphrodite's phi)
- geometric constructions - 2
- angles in a circle...
- archimedes' arbelos
- median to the hypotenuse
- inscribed quadrilaterals
- ptolemy's theorems
- power of a point
- the relative position of two circles
- central and inscribed angles
- a circle (equation)
- regular polygons
- simson line
- nine-point circle
- incircle and excircles of a triangle
- regular polygons-1
- an archimedes' formula
- area of a circle
- area of a circle-1
- radians
- equal chords
- an isosceles triangle...
- find the angles
- find the angle
- an equilateral triangle
- a Reuleaux triangle
- the witch of agnesi
- the cissoid of diocles
- deltoid
- astroid
- nephroid
- ranunculoid
- conchoid of nicomedes
- limacon of pascal
- cycloids
- conchoid of a circle
- piriform
- division of a segment
- an apollonian circle
- ellipse as a hypotrochoid
- ellipses and hyperbolas
- eight curve (construction)
- radical axis-1
- radical axis-2
- law of sines (proof)
- archimedes' twin circles
- roots of the quadratic equation
- archimedes' "salinon"
- the flower of life
- the seed of life
- yin-yang
- Johnson's theorem
- construction of a triangle (sss)
- miquel's triangle theorem
- proof of pythagorean-5
- hippias' quadratrix
- angle trisection
- first brocard point
- nagel point
- gergonne point
- rolling circle squares itself
- geometric-arithmetic mean inequality
- law of cosines (pww)
- chords and tangents
- regular star polygons
- squaring a rectangle
- pitot theorem
- angle between secants
- tangents to a circle
- a clock
- golden ratio-3
- equal chords-1
- the golden ratio and aphrodite's phi
- regular polygons
- angles in a circle...
- aristotle's wheel paradox
- parallel chords theorem
- secant-secant theorem
- tangent-secant theorem
- trigonometry_unit circle
- areas-3
- area of a triangle-2
- circle and ellipse
- Христос Bоскресе!
- circle-1
- f(x)=q+sqrt(r^2-(x-p)^2)
- basic trig numbers-2
- basic trig numbers-1
- rolling coin paradox
- feuerbach's point
- arc length (verification)
- tangent-chord angle-1
- tangent to a circle
- pentalpha
- properties of the altitudes
- common external tangents
- common internal tangents
- common external tangents-1
- common internal tangents-1
- approximating pi-1
- a clock-3
- proof of pythagorean-9
- circles of a regular n-gon
- Area of Circles (3)
- Rolling Coin 滾動的硬幣 (1)
- Seven Circles Theorem
- circumference of circles-1
- ferris wheel
- newton's disk
- a wheel of fortune-1
- conway circle
- regular polygons-3
