# Radial Gauges

Learn how to use Wijmo Radial Gauge components in this documentation topic

## Content

A radial gauge displays a metric as a percentage of the length of a circular scale, like a pie or donut chart with a single slice.

![Radial Gauge](https://cdn.mescius.io/document-site-files/images/3c7113e2-10b3-45ed-8f3b-9fb1e0af2b74/gauge/gauge-radial-gauge.png)

By default, the radial scale displays a 180-degree arc. You can change that by adjusting its __start__ and __sweep__ angles.

Example:

```JavaScript
import * as gauge from '@mescius/wijmo.gauge';

// create the gauge
var myRadialGauge = new gauge.RadialGauge('#myRadialGauge', {
  	isReadOnly: false,
  	min: 0,
    max: 100,
    startAngle: 0,
    sweepAngle: 180,
    value: 75
  });

```

If the __autoScale__ property is set to true, the control will automatically scale the gauge to fill the host element taking onto account the __startAngle__ and __sweepAngle__ properties.

![Auto Scaling](https://cdn.mescius.io/document-site-files/images/3c7113e2-10b3-45ed-8f3b-9fb1e0af2b74/gauge/gauge-autoscale.png)