Collinearity of three points

Area OF triangle || Quadrilateral || n-side polygon || Condition for collinearity OF three point || Example discussion || Area OF triangle in determinant form || Equation OF line joining two point

Conditions Forn Collinearity of Three Given Points|Important Questions|Locus|Important Questions|OMR

There are 20 points in a plane of which 5 are collinear and no three of the points are collinear unless all the three are from these 5 points. Find the number of different lines formed.

The are m points in a plane out of which p points are collinear and no three of the points are collinear unless all the three are from these p points. Find the number of different triangles formed by joining these points (by line segments).

There are 20 points in a plane out of which 7 points are collinear and no three of the points are collinear unless all the three are from these 7 points. Find the number of different straight lines.

There are 20 points in a plane of which 5 are collinear and no three of the points are collinear unless all the three are from these 5 points. Find the number of different straight lines passing through these points