Circle the part of the plane consisting of whose points P for which OP=r is the circle itself i.e. the set of all points lying on the circle is the circle itself.

Interior the part of the plane consisting of those points P for which OP

Exterior the part of the plane consisting of those points P for which OP>r is called the exterior of the circle with centre O and radius r.

Which of the following sets are finite or infinite?Justify. 8. The set of all the points on the circumfrence of the circle.

Chord of a circle a line segment with its end- points lying on a circle is called the chord of the circle.

Show that the relation R on the set A of points in a plane, given by R={(P , Q): Distance of the point P from the origin is same as the distance of the point Q from the origin}, is an equivalence relation. Further show that the set of all points related to a point P!=(0, 0) is the circle passing through P with origin as centre.

Tangents to a circle at points P and Q on the circle intersect at a point R. If PQ= 6 and PR= 5 then the radius of the circle is

Slope of tangent to the circle (x-r)^(2)+y^(2)=r^(2) at the point (x.y) lying on the circle is

OP……...OQ, where O is the centre of the circle, P lies on the circle and Q is in the interior of the circle.

The point which is equidistant from all the points on the circumference of a circle is called _______