What happens when you move points A , B , or C ?
Move around point A until [math]\angle[/math]B is 90[math]^\circ[/math]. What do you notice about the squares?
Move around point A again to a different distance, until [math]\angle[/math]B is 90[math]^\circ[/math]. What do you notice about the squares?
Move around point A one more time to a different distance until [math]\angle[/math]B is 90[math]^\circ[/math]. What do you notice about the squares?