A circular flowerbed has a measured diameter of 8 meters, (3/4) of which are planted with wild chrysanthemums, and the rest are planted with orchids. What is the planting area of orchids?
一个圆形花圃，测得的直径是8米，其中的(3/4)种野菊，剩余的部分种兰花，兰花的种植面积是多少？
<gadget id="calculator">8 / 2</gadget>
<output>4</output>

<gadget id="calculator">4 ** 2</gadget>
<output>16</output>

<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">1 - (3/4)</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">3.14 * 16 * (1/4)</gadget>
<output>12.56</output>

<result>12.56</result>