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# Ruby CMath cbrt() Method with example

• Last Updated : 07 Jan, 2020

cbrt method is a Math class method in Ruby which is used to calculate the cube root of the given value.

Syntax: Math.cbrt(z)

Parameter: Here, z is the value whose cube root is to be calculated.

Returns: This method returns the cube root of the given number.

Below programs illustrate the use of above-discussed method:

Example 1:

 `# Ruby code for cbrt() method``require ``'cmath'`` ` `# Initializing value``a = ``27``b = ``5``.``45`` ` `# Printing result  ``puts ``"Cube root value of a : #{CMath.cbrt(a)}\n\n"` `puts ``"cube root value of b : #{CMath.cbrt(b)}\n\n"`

Output:

```Cube root value of a : 3.0

cube root value of b : 1.7598088635408027
```

Example 2:

 `# Ruby code for cbrt() method``require ``'cmath'`` ` `# Initializing values ``a = ``78``b = ``729`` ` `# Printing result  ``puts ``"Cube root value of a : #{CMath.cbrt(a)}\n\n"` `puts ``"cube root value of b : #{CMath.cbrt(b)}\n\n"`

Output:

```Cube root value of a : 4.272658681697917

cube root value of b : 8.999999999999998
```
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