- The sine of an acute angle is defined in the context of a right-angled triangle, but can be applied to any angle using the unit circle.
- In the context of angles and triangles, “acute” refers to an angle that is greater than 0 degrees and less than 90 degrees.
- For any given angle, its sine is the ratio of the length of the side opposite that angle to the length of the longest side of the triangle (the hypotenuse).
- The maths notation for sine is
*sin*.

###### References

- The sine of an acute angle is defined in the context of a right-angled triangle, but can be applied to any angle using the unit circle.
- In the context of angles and triangles, “acute” refers to an angle that is greater than 0 degrees and less than 90 degrees.
- For any given angle, its sine is the ratio of the length of the side opposite that angle to the length of the longest side of the triangle (the hypotenuse).
- The maths notation for sine is
*sin*.