To find the equation of a circle when you know the radius and centre, use the formula \({(x - a)^2} + {(y - b)^2} = {r^2}\), where \((a,b)\) represents the centre of the circle, and \(r\) is the ...
I used to tell my students how to write the equation of a circle, given its center and radius. Then I would give them the center and radius of a circle and ask for an equation. Now I provide my ...
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