Teacher Wang made a square and an equilateral triangle teaching aid with a 60 cm long iron wire. The ratio of the side length of the square to the length of one side of the triangle is 3:1. What is the area of the square in square centimeters?
王老师用一根60厘米长的铁丝做一个正方形和一个等边三角形教具，正方形边长与三角形一条边长度的比是3：1，这个正方形的面积是多少平方厘米．
<gadget id="calculator">4 * 3</gadget>
<output>12</output>

<gadget id="calculator">3 + 12</gadget>
<output>15</output>

<gadget id="calculator">60 / 15</gadget>
<output>4</output>

<gadget id="calculator">3 * 4 * 3 * 4</gadget>
<output>144</output>

<result>144</result>