Cut a log whose cross-sectional circumference is 12.56dm into 5 sections, how much dm**2 is the surface area increased?
将一根横截面周长是12.56dm的圆木，截成5段，表面积增加了多少dm**2．
<gadget id="calculator">12.56 / 3.14 / 2</gadget>
<output>2</output>

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

<gadget id="calculator">3.14 * 4 * 8</gadget>
<output>100.48</output>

<result>100.48</result>