If a cylindrical steel material with a length of 80 cm and a base area of 30 cm2 is cut into two equal parts, the surface area will be increased by how many cm2.
一个长80厘米，底面积是30平方厘米的圆柱形钢材，把它截成相等的两段，表面积增加了多少平方厘米．
<gadget id="calculator">30 * 2</gadget>
<output>60</output>

<result>60</result>