A circle has the same area as a rectangle, and the diameter of the circle is 4 cm. If the length of the rectangle is 4 cm, what is the width in cm?
一个圆与一个长方形的面积相等，圆的直径是4厘米．如果长方形的长是4厘米，那么宽是多少厘米．
<gadget id="calculator">4 / 2</gadget>
<output>2</output>

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

<gadget id="calculator">4 / 4</gadget>
<output>1</output>

<gadget id="calculator">3.14 * 1</gadget>
<output>3.14</output>

<result>3.14</result>