If the length of the sides of a square is tripled, how many times does its surface area increase?
一个正方形的棱长增加了3倍，则它的表面积增加了多少倍
<gadget id="calculator">2 * 4</gadget>
<output>8</output>

<gadget id="calculator">8 ** 2</gadget>
<output>64</output>

<gadget id="calculator">6 * 64</gadget>
<output>384</output>

<gadget id="calculator">2 ** 2</gadget>
<output>4</output>

<gadget id="calculator">6 * 4</gadget>
<output>24</output>

<gadget id="calculator">384 / 24</gadget>
<output>16</output>

<gadget id="calculator">16 - 1</gadget>
<output>15</output>

<result>15</result>