If the side length of the cube is enlarged to 3 times of the original, then its surface area will be enlarged to how many times of the original.
如果正方体的棱长扩大到原来的3倍，那么它的表面积就扩大到原来的多少倍．
<gadget id="calculator">3 * 3</gadget>
<output>9</output>

<result>9</result>