Move items on a circular path around a central point There are various use-cases for these functions. The function returns the angle between the positive X-axis and the point (B,A). These functions do the calculation in the opposite direction: they take a numeric value as their argument and return the corresponding angle for it.įinally there’s atan2() which accepts two arguments A and B. The “arc” or “inverse” counterparts to sin(), cos(), and tan() are asin(), acos(), and atan() respectively. Note: For a good introduction on Trigonometry go check Math is Fun asin(), acos(), atan(), and atan2()

The tan() function of the -angle is used to draw the green line from the dot towards the X-axis.

Its length is equal to the -radius multiplied by the sine of the -angle.

The “opposite” (blue line) is a line from the center of the circle along the Y-axis.

Its length is equal to the -radius multiplied by the cosine of the -angle.

The “adjacent” (red line) is a line from the center of the circle along the X-axis.Its length is equal to the -radius of the circle.

The “hypotenuse” (yellow line) is a line from the center of the circle to the position of the dot.

In the demo below, these functions are used to draw the lines that make up the triangle surrounding the set -angle: Unlike their JavaScript counterparts, these functions accept both angles and radians as their argument.

tan(): Returns the tangent of an angle, which is a value between −∞ and +∞.

sin(): Returns the sine of an angle, which is a value between -1 and 1.

cos(): Returns the cosine of an angle, which is a value between -1 and 1.

Is tan sin over cos