Working with SAX (Using Attributes) (2)

Problem:   Compute the area of each of these figures:

     <?xml version="1.0"?> 
     <figures>
        <circle x="20" y="10" r="20"/>
        <rectangle x="-3" y="4" w="5" h="36"/>
        <ellipse x="-5" y="6" w="30" h="50"/>
        <rectangle x="7" y="23" w="58" h="45"/>
        <circle x="-2" y="5" r="35"/>
        <ellipse x="-10" y="-8" w="45" h="30"/>
     </figures>