Use two identical triangles with a height of 12 cm to form a parallelogram. The known area of the parallelogram is 60 square centimeters. What is the base of the original triangle in centimeters?
用两个完全相同的高为12厘米的三角形拼成一个平行四边形，已知的平行四边形的面积为60平方厘米，那么原三角形的底为多少厘米．
<gadget id="calculator">60 / 2</gadget>
<output>30</output>

<gadget id="calculator">2 / 12</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">30 * (1/6)</gadget>
<output>5</output>

<result>5</result>