Important Concepts and Formulas
1. The distance between two points P(x1,
y1) and Q(x2, y2) is given by:
This is called the distance formula.
2. The distance of a point P(x, y) from
the origin is given by:
3. The coordinates of the point P(x, y)
which divides the line segment joining the points P(x1, y1)
and Q(x2, y2) internally in the ratio m1 : m2 are given
by:
4. The mid-point of the line segment
joining the points A(x1, y1) and B(x2, y2)
is given by:
5. The area of the triangle formed by
the points A(x1, y1), B(x2, y2) and
C(x3, y3) is given by:
