General Formula for Circles

Topic:
Circle
1.) What do you notice the value of 'h' does to the circle?
2.) What do you notice the value of 'k' does to the circle?
3.) What do you notice the value of 'r' does to the circle?
4.) Change the values to h = 1, k = 1, r = 2 , what quadrant is the circle located in?