If the side length of a cube is 5 cm, if the side length is increased by 3 times, how many times will its surface area be increased
一个正方体的棱长5厘米，如果棱长扩大3倍，则它的表面积扩大多少倍
<gadget id="calculator">3 * 3</gadget>
<output>9</output>

<result>9</result>