What is the perimeter of the shape in centimeters after folding a circular piece of paper with a diameter of 10 centimeters in half?
将一个直径10厘米的圆形纸片沿直径对折后，这个图形的周长是多少厘米．
<gadget id="calculator">10 / 2</gadget>
<output>5</output>

<gadget id="calculator">3.14 * 5</gadget>
<output>15.7</output>

<gadget id="calculator">15.7 + 10</gadget>
<output>25.7</output>

<result>25.7</result>