If a cylinder whose base circumference is 12.56 decimeters is cut vertically into two half cylinders along its diameter, the surface area will increase by 48 square decimeters. How many square decimeters is the surface area of each half cylinder?
把一个底面周长是12.56分米的圆柱体，沿它的直径垂直切成两个半圆柱，表面积就增加48平方分米，每个半圆柱的表面积是多少平方分米？
<gadget id="calculator">48 / 2</gadget>
<output>24</output>

<gadget id="calculator">12.56 / 3.14</gadget>
<output>4</output>

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

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

<gadget id="calculator">3.14 * 4</gadget>
<output>12.56</output>

<gadget id="calculator">48 / 2 / 4</gadget>
<output>6</output>

<gadget id="calculator">6 / 2</gadget>
<output>3</output>

<gadget id="calculator">12.56 * 3</gadget>
<output>37.68</output>

<gadget id="calculator">24 + 12.56 + 37.68</gadget>
<output>74.24</output>

<result>74.24</result>