---
title: "E"
subtitle: "Constant in std::math"
excerpt: "The value of Euler’s number `e`."
layout: manual
---

The value of Euler’s number `e`.

```kcl
E: number = 2.71828182845904523536028747135266250_
```



### Examples

```kcl
exampleSketch = startSketchOn(XZ)
  |> startProfile(at = [0, 0])
  |> angledLine(
    angle = 30,
    length = 2 * E ^ 2,
  )
  |> yLine(endAbsolute = 0)
  |> close()

example = extrude(exampleSketch, length = 10)
```

![Rendered example of E 0](data:image/png;base64,[encoded data, 80284 characters])


