modeling-app/docs/kcl-std/functions/std-sketch-planeOf.md

---
title: "planeOf"
subtitle: "Function in std::sketch"
excerpt: "Find the plane a face lies on. Returns an error if the face doesn't lie on any plane (for example, the curved face of a cylinder)"
layout: manual
---

Find the plane a face lies on. Returns an error if the face doesn't lie on any plane (for example, the curved face of a cylinder)

```kcl
planeOf(
  @solid: Solid,
  face: TaggedFace,
): Plane
```



### Arguments

| Name | Type | Description | Required |
|----------|------|-------------|----------|
| `solid` | [`Solid`](/docs/kcl-std/types/std-types-Solid) | The solid whose face is being queried. | Yes |
| `face` | [`TaggedFace`](/docs/kcl-std/types/std-types-TaggedFace) | Find the plane which this face lies on. | Yes |

### Returns

[`Plane`](/docs/kcl-std/types/std-types-Plane) - An abstract plane.


### Examples

```kcl
triangle = startSketchOn(XY)
  |> polygon(radius = 3, numSides = 3, center = [0, 0])
  |> extrude(length = 2)

// Find the plane of the triangle's top face.
topPlane = planeOf(triangle, face = END)

// Create a new plane, 10 units above the triangle's top face.
startSketchOn(offsetPlane(topPlane, offset = 10))

```

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