A circular flower bed has an original diameter of 15 meters, and the ratio of the expanded diameter to the original is 4:3. What is the area of the expanded flower bed?
一个圆形花坛，原来直径是15米，扩建后的直径与原来的比是4：3，扩建后花坛的面积是多少？
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">15 / (3/4)</gadget>
<output>20</output>

<gadget id="calculator">20 / 2</gadget>
<output>10</output>

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

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

<result>314</result>