Definition let ABC and D be four points in a plane that :(i) not three of them are collinear ; and (ii)the line segments ABBCCD and DA do not intersect except at the their endpoints.

Definition let ABC and D be four points is in a plane such that : (i)no three of them are collinear (ii) the line segments ABBCCD and DA do not intersect except at their and points.

(i) No two line segments intersect except at their endpoints.

There are 18 points in a plane such that no three of them are in the same line except five points which are collinear. The number of triangles formed by these points, is

There are n points in a plane, No three being collinear except m of them which are collinear. The number of triangles that can be drawn with their vertices at three of the given points is

There are 10 points on a plane of which no three points are collinear.If lines are formed joining these points,find the maximum points of intersection of these lines.

If 20 lines are drawn in a plane such that no two of them are parallel and so three are concurrent,in how many points will they intersect each other?

There are 10 points in a plane and 4 of them are collinear.The number of straight lines joining any two of them is 4 b.40 c.38 d.39

There are 10 points in a plane of which no three points are collinear and four points are concyclic.The number of different circles are can be drawn through at least three points of these points is (A) 116 (B) 120 (C) 117 (D) none of these

Mark four points A,B,C and D in your notebook such that no three of them are collinear.Draw all the lines which join them in pairs as shown in Fig.How many such lines can be drawn? Write the names of these lines. Name the lines which are concurrent at A.