A circular flower bed, its diameter is about 10 meters, what is its approximate area?
一个圆形的花坛，它的直径约是10米，它的占地面积约是多少？
<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>

<result>78.5</result>