It is known that the circumference of a rectangle is equal to the circumference of a circle, the length of the rectangle is 10 cm, and the width is 43% less than the length, what is the area of the circle?
已知一个长方形的周长和圆的周长相等，长方形的长是10厘米，宽比长少43%，则圆的面积是多少？
<gadget id="calculator">43 / 100</gadget>
<output>43/100 = around 0.43</output>

<gadget id="calculator">1 - (43/100)</gadget>
<output>57/100 = around 0.57</output>

<gadget id="calculator">10 * (57/100)</gadget>
<output>57/10 = around 5.7</output>

<gadget id="calculator">10 + (57/10)</gadget>
<output>157/10 = around 15.7</output>

<gadget id="calculator">(157/10) * 2</gadget>
<output>157/5 = around 31.4</output>

<gadget id="calculator">(157/5) / 3.14 / 2</gadget>
<output>5</output>

<gadget id="calculator">3.14 * 5 * 5</gadget>
<output>78.5</output>

<result>78.5</result>