Cut a circular piece of paper with a radius of 8 cm into two semicircles, how many centimeters are added to the circumference of the two semicircles compared to the circle.
把一张半径为8厘米的圆形纸片剪成两个半圆，两个半圆的周长和比圆增加了多少厘米．
<gadget id="calculator">8 * 4</gadget>
<output>32</output>

<result>32</result>