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 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 ...

To use the derivimeter, you sight the curve through the center glass and twist the device so the cursor, which is a lens and mirror system that lets you precisely find a tangent line. You can read ...