Consider the five points comprising the vertices of a square and the intersection point of its diagonals. How many triangles can be formed using these points?

A plane contains 20 points of which 6 are collinear. How many different triangle can be formed with these points?

On a triangle ABC, on the side AB, 5 points are marked, 6 points are marked on the side BC and 3 points are marked on the side AC (none of the points being the vertex of the triangle). How many triangles can be made by using these points?

Seventeen points are marked on plane so that no three points are collinear. How many straight lines can be formed by joining these points?

There are n points in a plane of which 'p' points are collinear.How many lines can be formed from these points

What are the coordinate of intersection point of diagonals in the rectange ABDE.

How many triangles can be formed by joining the vertices of a hexagon?

Twenty points are marked on a plane so that non three points are collinear except 7 points. How many triangle can be formed by joining the points?

(i) Find the number of sides of a polygon if it has 35 diagonals. (ii) How many triangles can be formed with the vertices of an octagon?