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<rect name="矩形" fill="#FFFFFF" x="580" y="250" stroke="#0FFFFF" stroke-width="3" width="16" height="75"/>
<path d="M630 325 A 50 50 0 0 1 530 325 L630 325 z" stroke="black" fill="blue" stroke-width="2" fill-opacity="0.5"/><path name="三角形" fill="red" stroke="blue" d="M750 250 L770 325 L730 325 Z"/>
<rect name="矩形" fill="red" x="780" y="225" stroke="red" stroke-width="0" width="20" height="75"/>
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<path d="M730 325 A 50 50 0 0 0 740 365 L780 325 z" stroke="black" fill="red" stroke-width="2" fill-opacity="0.5"/>M移动到起点730 325 A画弧线到终点740,365， L连接点740,365和780 325，z将图形封闭起来。
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<path d="M730 325 A 50 50 0 0 0 740 365 L780 325 z" stroke="black" fill="red" stroke-width="2" fill-opacity="0.5"/>M移动到起点730 325 A画弧线到终点740,365， L连接点740,365和780 325，z将图形封闭起来。所以画扇形的方法就是
Mx y A r r 0 0 0 x+r-r*cos(α) y+r*sin(α) L x+r y z
这样就可以了，其中α为扇形的角，r为半径
