(1/5) of the circumference angle of a circle = how many degrees.
一个圆的周角的(1/5)=多少度．
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">360 * (1/5)</gadget>
<output>72</output>

<result>72</result>