Bisector
Circle

Color

Pythagoras distance (normal)
Manhatan distance
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Make your own function in javascript. It must take one parameter witch have x and y components and return a number - the length of the vector.
It can be a js function like:

function dist(a) {
return Math.sqrt(a.x * a.x + a.y * a.y);
}

or just an expression like :

sqrt(x * x + y * y)

*Note that this code will be added as a script to the page