Cut a small circle with a circumference of 12.56 cm into two semicircles and how many centimeters more than the original circumference.
把周长12.56厘米的小圆片剪成两个半圆的周长和比原来多多少厘米．
<gadget id="calculator">12.56 / 3.14</gadget>
<output>4</output>

<gadget id="calculator">4 * 2</gadget>
<output>8</output>

<result>8</result>