A vase cushion is circular, and its measured diameter is 60 cm. What is the area of this vase cushion?
一个花瓶垫是圆形，量得直径是60厘米，求这个花瓶垫的面积？
<gadget id="calculator">60 / 2</gadget>
<output>30</output>

<gadget id="calculator">30 ** 2</gadget>
<output>900</output>

<gadget id="calculator">3.14 * 900</gadget>
<output>2_826</output>

<result>2_826</result>