TOPICS

Formulae

Coordinate Geometry

1. The distance between P(x₁, y₁) and Q(x₂, y₂) =√(x₂-x₁)² + (y₂-y₁)²2. The distance of a point P(x, y) from the origin =√x² + y²

1. The coordinates of the point P(x, y) which divides the line segment joining the points A(x₁, y₁) and B(x₂, y₂) internally in the ratio m₁ : m₂ are 2. The mid-point of the line segment joining the points P(x₁, y₁) and Q(x₂, y₂) is

1. The area of the triangle formed by the points (x₁, y₁), (x₂, y₂) and (x₃, y₃) = 1/2[x₁(y₂ - y₃) + x₂(y₃ - y₁) + x₃(y₁ - y₂)]

1. Area of Rhombus = 1/2(product of its diagonals)

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