**Pi’s sine is equal to zero.** Pi is referred to as the sine function’s root or inflection point in trigonometry. The sine of pi, when stated in radians, is equivalent to the sine of either a 180Â° or 360Â° angle, both of which are also equal to zero.

The length of each side of a right triangle can be used to calculate the sine of a segment of a circle with pi radians.

The sine function calculates the right triangle’s ratio of the angle’s opposite side to its hypotenuse using the Pythagorean theorem. The trigonometrical operations cosine and tangent are connected to the sine function.