Circle from three points

Exploring how we could find the equation of a circle if given 3 points.
The three points are points on the circle.[br]Use them to find the equation of the circle[br][br]Use the steps below to answer the following questions.
Use the applet to check your method of finding the equation of the circle.
Step 1: What do we need to draw first?
Step 2: How would I find the equation of the perpendicular bisectors?[br]Remember I need to find both a point and the slope.
Step 3: What would I need to do with the equations of the perpendicular bisectors to find the centre?
Step 4: How would I find the length of the radius?
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Information: Circle from three points