Geofence KML file

I have downloaded geofence in kml format. Please find below content of kml file.

1. How to find the radius of below circle type gepfence.
2. What will be the format for coordinates in below content.

Thanks in advance...

<?xml version="1.0" encoding="utf-8"?>
<kml>
    <Document>
        <name>
            Geofences
        </name>
        <Placemark>
            <name>
                Test Geofence
            </name>
            <description color="55339900" width="30.4799995422"/>
            <Point>
                <coordinates>
                    -98.877,41.7057,0
                </coordinates>
            </Point>
        </Placemark>
    </Document>
</kml>