acos < Math < JavaScript

The Math acos() static method returns the inverse cosine (in radians) of a number.

    
    // Calculates angle of a right-angle triangle in radians
    function calcAngle(adjacent, hypotenuse) {
      return Math.acos(adjacent / hypotenuse);
    }

    const calcAngle = calcAngle(8, 10));

    console.log(calcAngle);
    // 0.6435011087932843