Interior the part of the plane consisting of those points P for which `OP < r` is called the interior of the circle with centre O and radius r.

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.

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

Two large plane mirrors OM and ON are arranged at 150° as shown in the figure. P is a point object and SS' is a long line perpendicular to the line OP. Find the length of the part of the line SS' on which two images of the point object P can be seen.

Interior point of a line segment

CIRCULAR REGION The part of the circle that consists of the circle and its interior is called the circular region.

For a point P in the XY plane.Let d_(1)(p),d_(2)(p) and d_(3)(p) be the distances of the point P from the x axis, y axis and x-y=0 respectively. If A is area of the region R consisting of all points P lying in the XY plane and satisfying d_(1)(P)+d_(2)(P)+sqrt(2)d_(3)(P)=5 then Which of the following is/are CORRECT