The diameter of a circular dining table is 80 cm, what is its area in square centimeters?
一个圆形餐桌的直径是80厘米，它的面积是多少平方厘米？
<gadget id="calculator">80 / 2</gadget>
<output>40</output>

<gadget id="calculator">40 ** 2</gadget>
<output>1_600</output>

<gadget id="calculator">3.14 * 1_600</gadget>
<output>5_024</output>

<result>5_024</result>