Find the value of x, if area of triangle is 35 square cms with vertices `(x,4),(2,-6)` and `(5,4)`.

Using determinant find the values of k so that the area of the triangle with vertices at the points (k,0),(4,0) and (0,2) is 4 sq units.

Using vectors find the area of triangle with vertices A (1,1,2) ,B (2,3,5) and C (1,5,5).

Find the area of a circle of radius 35 cm.

Find the area of a triangle whose vertices are A(3,8) ,B(-4,2) and C(5,-1).

Find the area of the triangle ABC having vertices A(-2, 3), B(-3, 4) and C(1, 2).

Find the area of the triangle whose vertices are (0, 0), (a, 0) and (0, b).

Find the areas of the triangle whose vertics are (4,4),(3,-2),(-3,16)

Find the area of the triangle whose vertices are.(ii) (-5,-1),(3,-5),(5,2)

Find the area of the triangle formed by joining the mid-points of the sides of the triangle whose vertices are (0,-1),(2,1) and (0,3).Find the ratio of this area to the area of the given triangle.