modeling-app/docs/kcl/segStartY.md

---
title: "segStartY"
excerpt: "Compute the starting point of the provided line segment along the 'y' axis."
layout: manual
---

Compute the starting point of the provided line segment along the 'y' axis.



```js
segStartY(tag: TagIdentifier) -> number
```


### Arguments

| Name | Type | Description | Required |
|----------|------|-------------|----------|
| `tag` | [`TagIdentifier`](/docs/kcl/types#tag-identifier) |  | Yes |

### Returns

`number` 


### Examples

```js
exampleSketch = startSketchOn('XZ')
  |> startProfileAt([0, 0], %)
  |> line([20, 0], %)
  |> line([0, 3], %, $thing)
  |> line([-10, 0], %)
  |> line([0, 20 - segStartY(thing)], %)
  |> line([-10, 0], %)
  |> close(%)

example = extrude(5, exampleSketch)
```

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