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 ...
A tangent to a circle at point P is a straight line that touches the circle at P. The tangent is perpendicular to the radius which ... y = mx + c\) so to find the equation you need to find the ...
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