What is the surface area of the largest cylinder that can be cut from a square piece of wood with a side length of 10 cm?
把一棱长10厘米的正方形木块削成一个最大的圆柱体，这个圆柱体的表面积是多少？
<gadget id="calculator">3.14 * 10 * 10</gadget>
<output>314</output>

<gadget id="calculator">10 / 2</gadget>
<output>5</output>

<gadget id="calculator">5 ** 2</gadget>
<output>25</output>

<gadget id="calculator">3.14 * 25 * 2</gadget>
<output>157</output>

<gadget id="calculator">314 + 157</gadget>
<output>471</output>

<result>471</result>