JavaScript Math methods/functions 😭

Question

var num = -50
console.log(abs(num));
/*
console.log(ceil(num));
console.log(cos(num));
console.log(pow(5, 2));
console.log(sqt(num));
console.log(tan(num));
console.log(sin(num));
*/
/*output is "Uncaught ReferenceError: abs is not defined
"

can someone explain why?? */

Answer 1

abs() function is defined in Math object.
You have to say Math.abs();

For example:
console.log(Math.abs(num));

reference: https://www.sololearn.com/learn/JavaScript/1243/