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modeling-app/docs/kcl-std/functions/std-math-legLen.md

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---
title: "legLen"
subtitle: "Function in std::math"
excerpt: "Compute the length of the given leg."
layout: manual
---
Compute the length of the given leg.
```kcl
legLen(
hypotenuse: number(Length),
leg: number(Length),
): number(deg)
```
### Arguments
| Name | Type | Description | Required |
|----------|------|-------------|----------|
| `hypotenuse` | [`number(Length)`](/docs/kcl-std/types/std-types-number) | The length of the triangle's hypotenuse. | Yes |
| `leg` | [`number(Length)`](/docs/kcl-std/types/std-types-number) | The length of one of the triangle's legs (i.e. non-hypotenuse side). | Yes |
### Returns
[`number(deg)`](/docs/kcl-std/types/std-types-number) - A number.
### Examples
```kcl
legLen(hypotenuse = 5, leg = 3)
```