[color=#000000]Explore the interactive activity [/color][color=#000000]and answer the questions that appear below the applet.[/color]

[color=#000000]Suppose [i]P(x,y)[/i] = any point that lies on a circle with center (h,k) and radius [i]r[/i], where [i]r[/i] > 0. [i] [br][/i]Use what you've observed to write an equation that expresses the relationship among [i]x[/i], [i]y[/i], and [i]r[/i]. [br](No need to square any binomial expressions!) [br][/color]