In a cylindrical container with a diameter of 20 cm, a conical iron block with a height of 10 cm is put into the water, and the water level rises by 0.3 cm. What is the area of the base of the conical iron block?
在一个直径是20厘米的圆柱形容器里，放入一个高为10厘米的圆锥形铁块，全部没入水中，这时水面上升0.3厘米．圆锥形铁块的底面积是多少平方厘米？
<gadget id="calculator">20 / 2</gadget>
<output>10</output>

<gadget id="calculator">10 ** 2</gadget>
<output>100</output>

<gadget id="calculator">3 / 10</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">3.14 * 100 * 0.3 * (3/10)</gadget>
<output>28.26</output>

<result>28.26</result>