After wrapping a 16-meter-long rope 5 times around a pillar in the hall, there is still 0.3 meters left. What is the area occupied by this pillar?
把一根长16米的绳子绕大厅柱子5圈后还剩下0.3米，这根柱子的占地面积是多少？
<gadget id="calculator">16 - 0.3</gadget>
<output>15.7</output>

<gadget id="calculator">15.7 / 5 / 3.14 / 2</gadget>
<output>0.5</output>

<gadget id="calculator">0.5 ** 2</gadget>
<output>0.25</output>

<gadget id="calculator">3.14 * 0.25</gadget>
<output>0.785</output>

<result>0.785</result>