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# What Is the Sin of Pi?

**The sine of pi is zero.** In trigonometry, pi is known as the root or inflection point of the sine function. When expressed in radians, the sine of pi is equivalent to the sine of a 180-degree or 360-degree angle, both of which are also equal to zero.

The sine of a segment of a circle with pi radians can be determined by forming a right triangle and determining the length of each side. Using the Pythagorean theorem, the sine function evaluates the ratio of the side opposite the angle over the hypotenuse of the right triangle. The sine function is related to the trigonometric functions cosine and tangent.

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Q:
## Who Discovered Pi in Math?

A: We will probably never know who discovered pi, or that the ratio of the circumference of a circle to its diameter is a constant. The search for that consta... Full Answer >Filed Under: -
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## What Is the Exact Value of Pi?

A: It is impossible to arrive at an exact value for pi because the digits that make up its decimal neither end nor repeat, according to Scientific American. I... Full Answer >Filed Under: -
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## How Do You Find the Cosine of Pi?

A: The trigonometric functions sine, cosine and tangent calculate the ratio of two sides in a right triangle when given an angle in that triangle. To find the... Full Answer >Filed Under: -
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## How Is Pi Used Today?

A: Pi is used today in practical applications that include astronomy, physics, engineering and architecture. The task of computing pi to billions or trillions... Full Answer >Filed Under: