Area of triangle Cordinate geometry from class 10 #shorts

The area of triangle whose sides are 10,10 and 16 is

A straight line L is perpendicular to the line 5x-y=1. The area of the triangle formed by the line L and the cordinate axes is 5 square units.Find the equation of the line L.

The length and breadth of a rectangle are in the ratio 4:3 . Then what is the ratio of the area of the triangle formed by the parts of the diagonals with a long side to the area of the triangle formed by the parts of diagonals with a short side?

In figure Delta ABC to an equalateral triangle with cordinate of B and C an B(1,0) and C(5,0) Find the co ordinate of value A.