- geometry
- radical axis-1
- the golden ratio (and aphrodite's phi)
- rose curves
- angles between parallels...
- measuring angles...
- the lune of Hippocrates
- pythagorean theorem (a puzzle)
- the lunes of Alhazen
- triangle angle-sum theorem
- pythagorean spiral
- geometric constructions - 13
- power of a point
- Fibonacci spiral
- square vs rhombus
- geometric constructions - 12
- geometric constructions - 11
- geometric constructions - 2
- archimedes' arbelos
- a prism inside a prism...
- reflections...
- area of a trapezoid
- ptolemy's theorems
- pythagorean and galileo's law
- area of a triangle
- area of a parallelogram
- area of a rectangle
- approximating pi
- constructing a hyperbola...
- constructing an ellipse...
- constructing a parabola
- a pyramid inside a cube...
- a math trick-2
- angles in a circle...
- tux walks up and down...
- a triangle
- quadrilaterals
- square roots in a greek way...
- Thales' theorem
- regular octagon
- angle bisector
- inscribed quadrilaterals
- tangent at a point
- tangent lines to a circle
- double reflection
- triangles...
- a decagon
- the intersept (thales) theorem
- midpoint parallelogram
- classifying triangles...
- the reflective property of parabola
- the reflective property of ellipse
- the reflective property of hyperbola
- point symmetry
- the angle bisector theorems
- the triangle inequality
- triangle midpoint theorem
- reflections-2
- areas inside a parallelogram
- areas inside a trapezoid
- archimedes' spiral
- reflections-3
- involute of a circle
- cardioid
- reflections-4
- pythagorean theorem (proof)
- tangent-chord angle
- area of a kite
- median to the hypotenuse
- areas of similar triangles
- equilateral triangle (SAS)
- find the slope
- a proof of pythagorean theorem-4
- measurements in a circle
- the relative position of two circles
- a cube...
- regular tetrahedron
- hexagonal prism
- square pyramid
- the outer Napoleon triangle
- a pyramid inside a cube-1
- reflections of a triangle
- the golden ratio
- central and inscribed angles
- sierpinski triangles
- find the area
- regular polygons
- an identity...
- an identity-2
- triangle-1
- area of a rectangle-1
- simson line
- nine-point circle
- angle bisector as locus
- incircle and excircles of a triangle
- regular polygons-1
- an archimedes' formula
- area of a circle
- area of a circle-1
- radians
- properties of a rhombus
- properties of a rectangle
- properties of a trapezoid
- properties of a parallelogram
- properties of a square
- axis of symmetry
- point of symmetry
- equal chords
- properties of an isosceles trapezoid
- an isosceles triangle...
- properties of a kite
- cuboid
- a tank with a tap
- find the angles
- find the angle
- an equilateral triangle
- sum of the interior angles of a n-gon
- a Reuleaux triangle
- congruent triangles
- area of an equilateral triangle
- the witch of agnesi
- the cissoid of diocles
- deltoid
- astroid
- nephroid
- ranunculoid
- conchoid of nicomedes
- limacon of pascal
- cycloids
- trammel of archimedes
- generalization (pappus) of pythagorean
- conchoid of a circle
- piriform
- ratio of areas-1
- ratio of areas-2
- division of a segment
- an apollonian circle
- parabolas
- ellipses
- hyperbolas
- a definition of conics (directrix)
- ellipse as a hypotrochoid
- ellipses and hyperbolas
- eight curve (construction)
- radical axis-2
- archimedes' twin circles
- archimedes' "salinon"
- the flower of life
- the seed of life
- yin-yang
- diagonals of n-gons
- Johnson's theorem
- Koch snowflake
- construction of a triangle (sss)
- miquel's triangle theorem
- proof of pythagorean-5
- Kaleidoscope
- the three squares problem
- hippias' quadratrix
- angle trisection
- first brocard point
- nagel point
- gergonne point
- collinear points-2
- morley's triangle
- rolling circle squares itself
- geometric-arithmetic mean inequality
- law of cosines (pww)
- vivianni's theorem
- x+1/x
- thm about right triangles
- chords and tangents
- regular star polygons
- squaring a rectangle
- pitot theorem
- angle between secants
- parallel tangents of an ellipse
- a property of the hyperbola
- tangents to a circle
- regular pentagon
- a clock
- a clock(2)
- five squares
- golden ratio-3
- golden triangle
- golden rectangle
- the famous "1/7" triangle
- the famous "1/5" square
- equal chords-1
- supplementary angles
- aristotle's wheel paradox
- parallel chords theorem
- from kite to rhombus and square
- chord theorem
- secant-secant theorem
- tangent-secant theorem
- fractions in a greek way...
- areas-3
- area of a triangle (sas)
- area of a quadrilateral
- area of a triangle-2
- Brahmagupta's formula
- a square in a square
- lemoine point
- exeter point
- pyth-proof
- pyth-proof7
- circle and ellipse
- bifolium
- kappacurve
- right strophoid
- parallel tangents of an ellipse-1
- folium
- torpedo curve
- constructing a trifolium
- trifolium-1
- bicorn
- trisectrix of maclaurin
- deltoid
- astroid
- versoria
- limacon of pascal-1
- cardioid-1
- cissoid of diokles
- lemniscate of bernoulli
- eightcurve
- conchoid of nicomedes-1
- ellipse-1
- circle-1
- hyperbola-1
- parabola-1
- quadrilaterals-2
- rolling coin paradox
- vecten points
- feuerbach's point
- arc length (verification)
- right triangle paradox
- square-rectangle paradox
- isosceles triangle paradox
- sphere in cylinder
- cone in cylinder
- tangent-chord angle-1
- inscribed angles-1
- tangent to a circle
- pentalpha
- star of david
- properties of the altitudes
- common external tangents
- common internal tangents
- common external tangents-1
- common internal tangents-1
- geometric mean theorem
- frustum of a right cone
- frustum of a regular pyramid
- cylinder in cone
- convex quadrilaterals
- approximating pi-1
- a clock-3
- find the area-1
- triangular numbers-1
- pythagorean triples-euclid
- pythagorean triples-plato
- pythagorean triples-proclus
- proof of pythagorean-9
- euclid's proof of pythagorean
- circles of a regular n-gon
- Area of Circles (3)
- Solving Similar Triangles (1)
- angles between parallels-1
- Water Triangle
- make an angle
- Seven Circles Theorem
- circumference of circles-1
- cube of a binomial
- cylinder in a cone
- ferris wheel
- the reuleaux triangle-1
- points and segments
- binomial formula
- difference of two squares
- conway circle
- parallels or not?
- lines through a point
- regular polygons-3
- string art
- the height of the pyramid
