Find the areas of the triangles the coordinates of whose angular points are respectively.
(1,3), (-7,6) and (5,-1).

Find the equations to the sides of the triangles of the coordinates of whose angular points are respectively: (1,4),(2,-3) and (-1,-2) .

Find the areas of the triangles the coordinates of whose angular points are: (-a,(pi)/(6))(a,(pi)/(2)), and (-2a,-(2 pi)/(3))

The equation of the sides of a triangle, the coordinates of whose angular points are: (3,5),(1,2) and (-7,4) .

Using the method of integration find the area of the triangle ABC, coordinates of whose vertices are A(2,0),B(4,5) and C(6,3) .

Find the area of the triangle whose vertices A, B, C are respectively, (3, 4), (-4, 3) and (8, 6) .

Find the area of a triangle ABC if the coordinates of the middle points of the sides of the triangle are (-1, -2), (6, 1) and (3, 5)

Find the coordinates of the centre of the circle inscribed in a triangle whose angular points are (-36,7),(20,7) and (0,-8)

Find the equations to the altitudes of the triangle whose angular points are A(2,-2),B(1,1) and C(-1,0)