[Home](./index.md) > [rc-js-util](./rc-js-util.md) > [Range2d](./rc-js-util.range2d.md) > [mat3Multiply](./rc-js-util.range2d.mat3multiply.md) ## Range2d.mat3Multiply() method **Signature:** ```typescript mat3Multiply(_mat: IReadonlyMat3, _writeTo?: Range2d): Range2d; ``` ## Parameters

Parameter	Type	Description
\_mat	[IReadonlyMat3](./rc-js-util.ireadonlymat3.md)<[TTypedArray](./rc-js-util.ttypedarray.md)>
\_writeTo	[Range2d](./rc-js-util.range2d.md)<TResult>	_(Optional)_

**Returns:** [Range2d](./rc-js-util.range2d.md)<TResult>