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LOCUS OF A POINT
A locus is a point which moves so that it satisfies a given condition. 2 simple problems on locus of a point satisfying a given condition are shown.
NORMAL FORM OF A LINE
Understand the formula to determine the normal form of a line. You need to remember that p is the length of the perpendicular from the origin to the line and the angle is made by this perpendicular with the positive direction of the x axis. 2 solved problems are illustrated.
COORDINATE GEOMETRY-FIND THE DISTANCE BETWEEN A POINT AND A LINE
ANGLE BETWEEN 2 LINES
2 problems are illustrated here.
A simple trick to find the orthocentre of a right angled triangle and
How to find the angle between 2 lines.
BISECTOR OF THE ANGLE BETWEEN 2 LINES
2 problems are given here. One is the very basic problem where we calculate the bisector of the angle between 2 lines using the standard formula. The second problem shows you how to find the bisector of the angle containing the origin. This is done using the same formula but keeping the constant terms positive.