There is a circular flower bed in the park with a diameter of 10 meters. Now the diameter of the flower bed is enlarged to 14 meters. How many square meters is the increased area of the flower bed?
公园里有一个圆形花坛，直径为10米，现将花坛的直径扩大到14米，花坛增加的面积是多少平方米？
<gadget id="calculator">14 / 2</gadget>
<output>7</output>

<gadget id="calculator">7 ** 2</gadget>
<output>49</output>

<gadget id="calculator">3.14 * 49</gadget>
<output>153.86</output>

<gadget id="calculator">10 / 2</gadget>
<output>5</output>

<gadget id="calculator">5 ** 2</gadget>
<output>25</output>

<gadget id="calculator">3.14 * 25</gadget>
<output>78.5</output>

<gadget id="calculator">153.86 - 78.5</gadget>
<output>75.36</output>

<result>75.36</result>