Let AB be any straight line.
OP = p is a perpendicular drawn to AB from the origin.Let the co-ordinates of P be (x,y).

From right-angled triangle OAP,
Again from right-angled triangle OAP,
AB makes intercepts psec a on the x-axis and pcosec a on the y-axis.
The equation of the line in the intercept form is given by
