Shapes, intersection, plotting co-ordinates... Tutorials for geometry that relates to programming can be found here! Plenty of code and pseudo-code examples can be found in the contained articles...
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A quick and painless method to rescale a given set of dimensions to find a best fit size within a new set of dimensions, while retaining apect ratio. Perfect for rescaling images or sprites, and best of all just a few short lines of code!
Finding and plotting points on the circumference of a circle: This article explains how to write a simple function that provides cartesian co-ordinates for a point based on a circles centre co-ordinates, its radius, and the degree of rotation.