The diameter of a circle is 5 cm, what is its radius in mm
一个圆的直径是5厘米，它的半径是多少毫米
<gadget id="calculator">5 / 2</gadget>
<output>5/2 = around 2.5</output>

<gadget id="calculator">(5/2) * 10</gadget>
<output>25</output>

<result>25</result>