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 joins the centre of the circle to the point P. As the tangent is a ...

As the tangent is a straight line, the equation of the tangent will be of the form \(y = mx + c\). We can use perpendicular gradients to find the value of \(m\), then use the coordinates of P to find ...

A math brain teaser that's probably easy for all of you, but which has stumped me for a while. How do they know how tall the pyramids are? I know you can use tangent to determine height **if you know ...