Equation of the line which is 10 units from the origin and the normal ray from the origin to it makes an angle π4 with positive direction of x-axis measured in the clockwise direction is

Given the perpendicular distance from origin to the line is p =10 and the angle made by the normal with x - axis is -η4  The normal form of the line is xcosα+ysinα=p, Hence, the equation of the line is  xcos-45∘+ysin-45∘=10  therefore, the equation of the line is x-y=102