From Wikimedia Commons, the free media repository
Here I just make and upload not very wonderful pictures to try and help out with what I write on en.wikipedia.
You can find my wiki persona there at [User:Dmcq].
My contributions here[edit]

Sprung floor: Basketweave

Sprung floor: Low profile


Construction of cube root of 2 using origami

Trisecting an angle using origami

Illustration of Maekawas Theorem number of valley's and folds differs by 2 at a point

Crease pattern for 25 point sea urchin type solution for Napkin folding problem

Crease pattern for an example Miuraori

Smart waterbomb  circular base and curved folds

SelfridgeConway fair division

stromquist movingknife procedure

Math MOS geometry illustration

Illustrate what the hypotenuse is

Principal value of the arg function

circle with some values of atan2

Deriviative of exponential function equals the function

Euclid bk1 prop5 pons asinorum, greek letters

Euclid bk1 prop5 pons asinorum, english letters

Multiplication example 4 bags of three coloured marbles

Area of field by multiplication

A proof without words for the pizza theorem

A proof without words for Nicomachus's theorem

Area of annulus determined by tangent length

Basic idea of Mamikon's theorem

Finding the area of a cycloid using Mamikon's theorem

Solving polynomials using Lill's method

Solution of ax^{2}+bx+c using Lill's method. Solutions are −AX1/SA, −AX2/SA

Spherical coordinate system with a common maths convention opposite to that in physics

Penrose tiling of gingerbread men

Penrose tiling like a Roman floor

Perspective projection of a tesseract with hidden vertex elimination.

Normalized IQ distribution mean 100 and standard deviation 15