The diameter of the circle is 16cm, and the length of the rectangle is 16cm. The area of the circle is equal to the area of the rectangle. What is the width of the rectangle?
圆的直径16cm，长方形的长16cm，圆的面积和长方形的面积相等，长方形的宽是多少？
<gadget id="calculator">16 / 2</gadget>
<output>8</output>

<gadget id="calculator">8 ** 2</gadget>
<output>64</output>

<gadget id="calculator">64 / 16</gadget>
<output>4</output>

<gadget id="calculator">3.14 * 4</gadget>
<output>12.56</output>

<result>12.56</result>