# n(a) = Polygon Definition

```
n(a) = { yappPolygonDef } : Required if shape = yappPolygon specified
```

* Predefined Shapes:"
* shapeIsoTriangle - An Isosceles triangle. Note the width is equal to the bounding width but the height is less.
* shapeIsoTriangle2 - an Isosceles triangle with the center at the center of the bounding box.
* shapeHexagon - a hexagon centered in the bounding rectangle.
* shape6ptStar - a 6 pointed star centered in the bounding rectangle.
*  shapeTriangle - triangle with height and width matching the bounding rectangle but centered in the rectangle.
* shapeTriangle2- triangle with height and width matching the bounding rectangle. At 90 degree increments the base of the triangle aligns with the bounding box. 
* shapeArrow - Home plate shaped arrow. Useful for buttons.

<figure><img src="/files/ph2NEzjGIWWrdtYxKz6A" alt=""><figcaption><p>20x20 shapes with the bounding rectangle in pink.</p></figcaption></figure>

Notice how the center affects the rotation of the shapes.

see [Polygon Definition](/yappgenerator_en/advanced-options/polygon-definitions.md) to create your own polygons.


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