Divide a circle into sixteen equal parts and assemble a rectangle. The approximate perimeter of the rectangle is 16cm longer than the perimeter of the circle. What is the area of the circle?
把一个圆分成十六等份，拼成一个长方形，长方形近似周长比圆周长增加了16cm，圆的面积是多少．
<gadget id="calculator">16 / 2</gadget>
<output>8</output>

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

<gadget id="calculator">3.14 * 64</gadget>
<output>200.96</output>

<result>200.96</result>