How can you find the perimeter of a circle on grid paper

Atriangle on a coordinate plane is translated which is another way to write this rule? (x, y) - (x + 4. y - 8) (x,y) - (x -4.7-8) (x,y) - (x - 8, y + 4) (x,y) - (x + 8, y - 4)