In the coordinate plane, you can use the Pythagorean Theorem to find the distance between any two points. The distance between the two points (x 1 ,y 1) and (x 2 ,y 2) is. For example: To find the distance between A(1,1) and B(3,4), we form a right angled triangle with as the hypotenuse. The length of = 3 – 1 = 2.