- pictures
- Fibonacci spiral
- modern teacher
- a math trick-3
- measuring van gogh's cypress
- the golden ratio (and aphrodite's phi)
- tux walks up and down...
- solve the equation
- find the tan(φ)
- area of a circle-1
- area of a circle
- quadratic formula
- Vieta's formulas
- components of a force
- find the angles
- find the angle
- sum of the interior angles of a n-gon
- locating reals on a number line
- adding and subtracting integers
- trammel of archimedes
- regular star polygons
- Христос Bоскресе!
- rolling coin paradox
- circles of a regular n-gon
- a multiplication table
- fractional exponents
- tangram puzzle-1
- newton's disk
- fraction to decimal
- rolling two dice-1
- rolling a dice
- egyptian system of numeration
- the height of the pyramid
