The number ratio of chickens, ducks, and geese is 3:2:1, draw a fan-shaped statistical chart, and what is the central angle of the fan-shaped circle that represents the number of chickens.
鸡、鸭、鹅的只数比是3：2：1，画成扇形统计图，表示鸡的只数的扇形的圆心角是多少度．
<gadget id="calculator">3 + 2 + 1</gadget>
<output>6</output>

<gadget id="calculator">3 / 6</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">360 * (1/2)</gadget>
<output>180</output>

<result>180</result>