A line perpendicular to a radius at its point on the circle necessarily not be a tangent to the circle.
Which of the following statements is not true ?
(a) A tangent to a circle intersects the circle exactly at one point.
(b) The point common to the circle and its tangent is called the point of contact.
(c) The tangent at any point of a cricle is perpendicular to the radius of the circle through the point of contact.
(d) A straight line can meet a circle at one point only.