What is the area of a circle with a diameter of 2 decimeters in square centimetres?
直径2分米的圆，它的面积是多少平方厘米
<gadget id="calculator">2 / 2</gadget>
<output>1</output>

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

<gadget id="calculator">3.14 * 1 * 100</gadget>
<output>314</output>

<result>314</result>