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# Math

Many mathematical functions are grouped together in the `Math` object. For example, `Math.sqrt(x)` returns the square root and `Math.pow(x, y)` calculates x to the power of y.
``````var y1 = Math.sqrt(9);
var y2 = Math.pow(10, 3);``````
`y1` has the value `3` and `y2` has the value `1000` (10³ = 10 * 10 * 10 = 1000).

## Exercise

Write a function `hypotenuse` that calculates the length of the hypotenuse of a right triangle. The length of the two legs is passed to the function. Tip: In a right triangle the Pythagorean theorem is valid. If a and b are the lengths of the two legs and c is the length of the hypotenuse, the following is true: a² + b² = c². Since 3² + 4² = 5² applies, `hypotenuse(3, 4)` should return `5`.
``````var hypotenuse = function(a, b) {
var cSquare = Math.pow(a, 2) + Math.pow(b, 2);
return ...
};``````
``````var hypotenuse = function(a, b) {
var cSquare = Math.pow(a, 2) + Math.pow(b, 2);
return Math.sqrt(cSquare);
};``````