Cut a cuboid with length, width and height of 10, 10 and 15 cm into the largest cylinder, find the surface area of the cylinder.
将长、宽、高分别为10、10、15厘米的长方体切削成最大的圆柱，求圆柱的表面积．
<gadget id="calculator">3.14 * 10 * 15</gadget>
<output>471</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">471 + 157</gadget>
<output>628</output>

<result>628</result>