A cylindrical steel is 1.6dm long, cut it into two sections (two cylinders), its surface area increases by 2.8dm**2, find the volume of this round steel.
一根圆柱钢材长1.6dm，将它截成两段(两个圆柱)，它的表面积增加2.8dm**2，求这根圆钢的体积．
<gadget id="calculator">2.8 / 2</gadget>
<output>1.4</output>

<gadget id="calculator">1.4 * 1.6</gadget>
<output>2.24</output>

<result>2.24</result>