# A square of side lies above the  axis  and has one vertex at the origin. The side passing through the origin makes an angle   with the positive direction of  axis. The equation of its diagonal not passing through the origin is Option 1) Option 2) Option 3) Option 4)

As we learnt in

Two – point form of a straight line -

- wherein

The lines passes through    and

Slope of a line -

If  is the angle at which a straight line is inclined to a positive direction of x-axis, then the slope is defined by

.

- wherein

Equation of diagonal AB is

Option 1)

Incorrect

Option 2)

Incorrect

Option 3)

Correct

Option 4)

Incorrect

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