For a right-angled triangle, enter the hypotenuse/adjacent side/opposite side to automatically calculate the angle.
Angle calculator
![](https://lazyorangelife.com/wp-content/uploads/2021/06/Trigonometric-function.png)
Calculation instructions
Using the trigonometric function theorem, given an acute angle θ, a right-angled triangle is made. Let the lengths of the hypotenuse, the adjacent side and the opposite side of this triangle be R, X, and Y respectively.
![](https://lazyorangelife.com/wp-content/uploads/2021/06/Trigonometric-function-2.png)