venn.js
function distance(p1, p2) {
        return Math.sqrt((p1.x - p2.x) * (p1.x - p2.x) +
                         (p1.y - p2.y) * (p1.y - p2.y));
    }
function distance(p1, p2) {
        return Math.sqrt((p1.x - p2.x) * (p1.x - p2.x) +
                         (p1.y - p2.y) * (p1.y - p2.y));
    }
function distance ( p1 , p2 ) { return Math . sqrt ( ( p1 . x - p2 . x ) * ( p1 . x - p2 . x ) + ( p1 . y - p2 . y ) * ( p1 . y - p2 . y ) ) ; }
euclidean distance between two points
euclidean distance between two points