A small triangular garden has a base of 13.5 meters and three times its height. What is the area of this small garden in square meters?
一个三角形的小花园，底是13.5米，是高的3倍，这个小花园的面积是多少平方米．
<gadget id="calculator">13.5 / 3</gadget>
<output>4.5</output>

<gadget id="calculator">13.5 / 2</gadget>
<output>6.75</output>

<gadget id="calculator">4.5 * 6.75</gadget>
<output>30.375</output>

<result>30.375</result>