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10th Class Maths Solutions - Ch 10 Circles Brief description : Circle  is a collection of all the points in a plane surface which are at a constant distance from a center i.e. a fixed point. Circumference  is the outer parameter of the circle. Radius  can be a line from any point on the circumference to the center of the circle. Now we will discuss a new topic as per  CBSE Maths  syllabus ‘Tangent to a circle’. Tangent to a circle In the above diagram, only one-point A is common to the circle and the line PQ, this is called Tangent to a circle. Therefore, as a definition,  a line that intersects circle at one point only is called Tangent to the circle Points to Ponder There is only one unique tangent at a point of the circle. When the two end points of its corresponding chord coincide thenthe tangent to a circle is a special case of the secant. The common point of the tangent and the circle is called the  point of contact  (Point A in above figure) and the ta