Q. 74.1( 148 Votes )

Find the slope of the line, which makes an angle of 30° with the positive direction of y-axis measured anticlockwise.

Answer :

If a line makes an angle of 30° with the positive direction of y-axis measured anti-clock-wise , then the angle made by the line with the positive direction of x- axis measure anti-clock-wise is 90° + 30° = 120°



The slope of the given line is tan 120° = tan (180° - 60°) = - tan 60° = -


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