A tangent to a circle at point P is a straight line ... in to the formula \(y = mx + c\) gives: So the equation of the tangent \(y = -\frac{1}{2} x + 5\). Finally, the point where the tangent ...

This circle has the centre at the origin and a radius of 1 unit. The point P can move around the circumference of the circle. At point P the \(x\)-coordinate is \(\cos{\theta}\) and the \(y ...