



Cylinder With Equations Gifts. This translucent cylinder is annotated with the formulas for circumference, area of the circle, surface area of the wall, and volume of the cylinder. Perfect for those who love pi. 
Pythagoras' Theorem Gifts. A simple and clean design showing four different rightangled triangles whose sides have been extended as their squares to illustrate the fact that the square of the hypotenuse is equal to the sume of the squares of the other two side. These are actually stills taken from my Pythagoras' Theorem Animation. 
Sphere With Equations Gifts. This translucent sphere is annotated with the formulas for circumference, area of the circle (great circle, in this case), surface area of the sphere, and volume of the sphere. Perfect for those who love pi. 
Cone With Equations Gifts. This translucent cone is annotated with the formulas for circumference of the conical base, area of the conical base, area of cone wall, and volume of the cone. 


Tangent Graph Machine Gifts. This imaginary mathematical machine image was taken from my tangent graph engine animation. As the wheel turns, so its extended diameter traces out green tangent waves. Perfect for lovers of steampunk, since it evokes steam powered industrial revolution engines. 




Solid of Revolution #5. An area (red), bounded by a curve that goes above and below the X axis, rotates about the X axis. 
 