List of top Mathematics Questions on Triangles asked in MAT

The number of triangles formed by the 11 points, out of which 5 are collinear in a plane is
Ten points are marked on a straight line and eleven points are marked on another straight line. How many triangles can be constructed with vertices from among the above points?
In a triangle ABC, ∠A = 900 and D is mid-point of AC. The value of BC2 - BD2 is equal to
A right-angled triangle has a hypotenuse of 13 cm and one side of 12 cm. Its area is