- English
- the golden ratio (and aphrodite's phi)
- function - tangent - derivatives
- inscribed quadrilaterals
- the exponential and the logarithmic functions
- the quadratic function-1
- ptolemy's theorems
- find the function (sine curves)
- find the function
- function and derivatives-9
- function and derivatives-8
- function and derivatives-7
- function and derivatives-6
- function and derivatives-5
- vectors - a no word introduction
- find the slope
- function and derivatives-4
- equilateral triangle (SAS)
- a family of lines
- graph the line
- a math trick-3
- minimum area
- find the equation of the line
- function and derivatives-3
- function and derivatives-2
- function and derivatives-1
- measuring van gogh's cypress
- areas of similar triangles
- a math trick-1
- median to the hypotenuse
- a math trick-2
- square vs rhombus
- pythagorean theorem (proof)
- eight curve
- reflections-4
- rose curves
- cardioid
- involute of a circle
- reflections-3
- hyperbolic spiral
- cochleoid
- lituus
- fermat's spiral
- pythagorean spiral
- reflections-2
- maximum volume
- minimum perimeter
- areas inside a parallelogram
- areas inside a trapezoid
- pythagorean and galileo's law
- archimedes' spiral
- the logarithmic spiral
- power of a point
- area between a curve and x-axis
- area between two curves
- the lunes of Alhazen
- archimedes' arbelos
- Fibonacci spiral
- Vectors_1
- vectors_2
- a translation of y=-2x^2
- triangle midpoint theorem
- the triangle inequality
- a translation of the curve y=-1/x
- the locus of the intersection of two lines
- the angle bisector theorems
- the lune of Hippocrates
- a hyperbola (equation)
- conjugate hyperbolas
- point symmetry
- the reflective property of hyperbola
- the reflective property of ellipse
- the reflective property of parabola
- classifying triangles...
- the distance between two points
- an ellipse (equation)
- exploring sine curves
- a parabola (equation)
- a circle (equation)
- midpoint parallelogram
- a decagon
- the intersept (thales) theorem
- a function...
- double reflection
- Garfield's proof for pythagorean theorem
- triangles...
- tangent at a point
- the graphs of trigonometric functions
- tangent lines to a circle
- regular octagon
- angle bisector
- Thales' theorem
- tangent-chord angle
- triangle angle-sum theorem
- square roots in a greek way...
- angles between parallels...
- y=mx+b
- measuring angles...
- trig values of any angle
- equation of a line
- reflections...
- a proof of pythagorean theorem-4
- pythagorean theorem (a puzzle)
- geometric constructions - 12
- geometric constructions - 13
- 2x2 linear system (Cramer's rule)
- an identity...
- moving a parabola
- geometric constructions - 11
- geometric constructions - 2
- area of a kite
- unit circle definition of trig functions
- area of a parallelogram
- a proof of pythagorean theorem
- area of a triangle
- area of a trapezoid
- area of a rectangle
- 2x2 linear system-1
- a pyramid inside a cube...
- tux walks up and down...
- a prism inside a prism...
- the line: ax+by=c
- approximating pi
- constructing a hyperbola...
- constructing a parabola
- constructing an ellipse...
- the quadratic function
- adding integers...
- locating reals on a number line
- a triangle
- angles in a circle...
- measurements in a circle
- modern teacher
- the relative position of two circles
- a cube...
- regular tetrahedron
- cube3d
- five roses
- hexagonal prism
- square pyramid
- the outer Napoleon triangle
- a pyramid inside a cube-1
- reflections of a triangle
- equation of a line (A, m)
- equation of a line (A, B)
- equation of a line (linear form)
- the golden ratio
- a testmaker
- translations of f(x)=|x|
- central and inscribed angles
- translations of f(x)=x^2
- translations of f(x)=sqrt(x)
- even or odd?
- Vieta's formulas
- sierpinski triangles
- translations of f(x)=1/x
- find the area
- quadratic formula
- cartesian system
- the graph of a function
- regular polygons
- an identity-2
- triangle-1
- right triangle trigonometry-1
- area of a rectangle-1
- the linear function
- 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
- find the tan(φ)
- solve the equation
- equal chords
- properties of an isosceles trapezoid
- an isosceles triangle...
- properties of a kite
- cuboid
- f(x)=a|x-b|+c
- a tank with a tap
- absolute value inequalities
- components of a force
- f(x)=a/(x-b)+c
- f(x)=mx+b
- find the angles
- f(x)=ax^2+bx+c
- find the angle
- f(x)=atan(b(x-c))+d
- an equilateral triangle
- perpendicular lines
- f(x)=a^x, g(x)=log_a(x)
- the addition law of probability
- right triangle trigonometry-2
- sum of the interior angles of a n-gon
- a Reuleaux triangle
- congruent triangles
- minimum area (line)
- maximum area (angle)
- adding and subtracting integers
- the complex plane
- adding complex numbers
- linear transformations-1
- linear transformations-2
- 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
- coordinates-1 (reflection)
- coordinates-2 (distance)
- equilateral hyperbola
- 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)
- coordinates of midpoint
- f(x)=sinx/x
- radical axis-1
- radical axis-2
- law of sines (proof)
- law of cosines (proof)
- tangent and derivative
- f(x)=xsin(1/x)
- archimedes' twin circles
- roots of the quadratic equation
- f(x)=(cosx-1)/x
- f(x)=e^x/x
- f(x)=lnx/x
- f(x)=xlnx-x+c
- 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
- x/a+y/b=1
- collinear points-1
- collinear points-2
- morley's triangle
- rolling circle squares itself
- geometric-arithmetic mean inequality
- distance between point-line
- napier's inequality
- law of cosines (pww)
- vivianni's theorem
- aristarchus' inequalities
- x+1/x
- thm about right triangles
- chords and tangents
- regular star polygons
- squaring a rectangle
- pitot theorem
- colors
- f(x)=|αx^2+bx+c|
- f(x)=ax^4+bx^2+c
- quadratic function in any form
- angle between secants
- the common tangent of two parabolas
- parallel tangents of an ellipse
- a property of the hyperbola
- the center of an interval
- absolute value
- 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
- f(x)=asin(b(x-c))+d
- f(x)=acos(b(x-c))+d
- coordinates of a vector
- aristotle's wheel paradox
- parallel chords theorem
- similar ellipses
- eccentricity of an ellipse
- coordinates-3 (reflection)
- from kite to rhombus and square
- chord theorem
- secant-secant theorem
- tangent-secant theorem
- trigonometry_unit circle
- fractions in a greek way...
- the mean value theorem
- areas-3
- area of a triangle (sas)
- area of a quadrilateral
- area of a triangle-2
- Brahmagupta's formula
- area of an ellipse
- a square in a square
- an extrema problem-1
- an extrema problem-2
- lemoine point
- exeter point
- pyth-proof
- pyth-proof7
- a butterfly curve
- devil's curves
- parametric ellipse
- trifolium
- parametric hyperbola
- circle and ellipse
- bifolium
- fish curve
- devil's curves-1
- devil's curves-2
- kappacurve
- right strophoid
- parallel tangents of an ellipse-1
- find LCM and GCD
- f(x)=ax^n
- f(x)=x^q
- 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
- inverse of f(x)=mx+b
- inverse of f(x)=q+sqrt(a(x-p))
- f(x)=q+sqrt(r^2-(x-p)^2)
- inverse of f(x)=q+a(x-p)^3
- quadrilaterals-2
- inverse of f(x)=q+a^(x-p)
- basic trig numbers-2
- basic trig numbers-1
- f(x)=psinx+qcosx
- dot product
- an extrema problem-3
- polar form of a complex
- the nth roots of unity
- rolling coin paradox
- vecten points
- feuerbach's point
- arc length (verification)
- pythagorean (verification)
- right triangle paradox
- square-rectangle paradox
- isosceles triangle paradox
- sphere in cylinder
- cone in cylinder
- all the lines
- tangent-chord angle-1
- inscribed angles-1
- tangent to a circle
- an extrema problem-4
- an extrema problem-5
- 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
- a butterfly curve-1
- convex quadrilaterals
- approximating pi-1
- 2x2 linear system
- a clock-3
- find the area-1
- square numbers
- triangular numbers
- triangular numbers-1
- pythagorean triples-euclid
- pythagorean triples-plato
- pythagorean triples-proclus
- proof of pythagorean-9
- euclid's proof of pythagorean
- multiplicative inverse of a complex
- devil's curves-3
- circles of a regular n-gon
- the bell curve
- pascal's triangle
- a multiplication table
- absolute value inequalities2
- absolute value inequalities1
- Area of Circles (3)
- Shading Venn Diagrams (1)
- equations and problems
- pendulum
- Rolling Coin 滾動的硬幣 (1)
- Solving Similar Triangles (1)
- fractional exponents
- The Sum of the First n Natural Numbers - Dynamic Proof
- angles between parallels-1
- Practicing Statistical Calculation-1
- pie chart
- distribution of letters
- Sum of the Cubes
- histograms
- Water Triangle
- measures of center
- pi digits
- make an angle
- linear system
- frequency scale
- Seven Circles Theorem
- circumference of circles-1
- tangram puzzle-1
- multiplication table-1
- fraction αddition
- coin flipping-1
- flipping 5 coins
- flipping a coin
- evaluating logarithms practice
- fraction division: a ÷ b (partitive)
- fraction multiplication
- comparing fractions
- subtraction of proper fractions
- binomial and normal
- random data-1
- random data-2
- coin tossing simulation
- newton's cradle
- dotplot
- russian multiplication
- a math trick-31
- cube of a binomial
- binomial distribution
- cylinder in a cone
- absolute value inequalities-test
- graph the line-1
- a wheel of fortune
- ferris wheel
- wheel of fortune-1
- the reuleaux triangle-1
- newton's disk
- integration
- a wheel of fortune-1
- fraction to decimal
- points and segments
- binomial formula
- difference of two squares
- conway circle
- tangent and derivative
- parallels or not?
- lines through a point
- rolling two dice-1
- rolling a dice
- egyptian system of numeration
- rolling two dice
- regular polygons-3
- Fahrenheit to Celsius
- the sum of the first n odd
- sieve of eratosthenes
- moon and sea
- decimal and binary systems
- temperature
- string art
- the height of the pyramid
