A square steel with a square cross section is 180cm long. After sawing it into two equal sections, the surface area increases by 20cm**2 compared to the original one. What is the volume of each section of square steel in cm**3?
一根横截面是正方形的方钢长180cm，把它锯成相等的两段后，表面积比原来增加了20cm**2，每段方钢的体积是多少cm**3．
<gadget id="calculator">20 / 2</gadget>
<output>10</output>

<gadget id="calculator">180 / 2</gadget>
<output>90</output>

<gadget id="calculator">10 * 90</gadget>
<output>900</output>

<result>900</result>