cylindrical wood with a length of 15 decimeters and a cross-sectional diameter of 4 decimeters is cut into three small cylinders on average. What is the surface area of each small wood?
一根长15分米，横截面直径是4分米的圆柱形木材，将它平均截成三个小圆柱形，每根小木材的表面积是多少？
<gadget id="calculator">15 / 3</gadget>
<output>5</output>

<gadget id="calculator">3.14 * 4 * 5</gadget>
<output>62.8</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 * 2</gadget>
<output>25.12</output>

<gadget id="calculator">62.8 + 25.12</gadget>
<output>87.92</output>

<result>87.92</result>