Derive the formula for coordinates of excentres of a triangle?

Excentre of a Triangle

Derive lens formula for a concave lens.

Derive the formula of Area of circle.

Derive the formula for critical velocity (V).

Derive the formula for height and area of an equilateral triangle.

The coordinates of the mid-points of the sides of a triangle are (4, 2), (3, 3) and (2, 2). What will be the coordinates of the centroid of the triangle?

Derive the formula for the volume of the frustum of a cone.

Derive the formula for the volume of the frustum of a cone.

A(4,2), B(6,5) and C(1,4) are the vertices of triangle ABC Using centroid formula , find coordinates of centroid G .