The normal to a curve is the line perpendicular to the tangent to the curve at a given point. THAT IS DISTANCE OF CENTRE OT THE CIRCLE TO Y AXISRADIUS OF THE CIRCLE. At the point of tangency the tangent of the circle is perpendicular to the radius.
How to Find the Tangent of a Circle.
Catch up following Coronavirus. The tangent to a circle equation x 2 y 2 a 2 for a line y mx c is y mx a 1 m 2 Condition of Tangency The tangent is considered only when it touches a curve at a single point or else it is said to be simply a line. The tangent line AB touches the circle at D. From the equation of the circle x2 y26x8y 9 0 x 2 y 2 6 x 8 y 9 0.