Question

The distance from the centre of a circle to a point P outside the circle is 12 mm. The length of the tangent segment from P to the circle is 9 mm. Determine the radius of the circle.

Answer 1

This is a right angled triangle;

Using pythagoras theorem, we have;

`\begin{gathered} r=√(12^2-9^2) \\ r=3√(7)=7.94mm \end{gathered}`

Thus, the radius is 7.94mm