The value of trigonometric tangent of an angle, made by a straight-line with horizontal axis in anticlockwise direction, is defined slope of the straight line.
Straight lines are often appeared in a plane by making some angle with horizontal axis. The angle of the straight line has a direct relation with the slope of the straight line. This property shows a way to evaluate slope of a straight line from its angle, made with horizontal axis in anticlockwise direction.
is a straight line in a plane and also assume it makes some angle with horizontal axis in anticlockwise direction.
Draw a horizontal line from point
towards right side and also draw a vertical line from
downwards. The line drawn from point
and the line drawn from point
meet at a particular point on the plane.
The intersecting point of two perpendicular lines is assumed to call point
. Thus, the line
forms a right angled triangle
. Assume, the angle of a triangle
. It means, the straight line
made an angle
in anticlockwise direction with a horizontal line
(parallel to horizontal axis).
According to principle definition, the value of tangent of angle is known slope of the straight line. It means, slope of the straight line is written as
mathematically. In mathematics, the letter
is used to denote the slope of the straight line.
Therefore, the slope of the straight line is
This mathematical relation is mainly used to evaluate slope of the straight line from the angle, made by the same line.
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