The perimeter of an equilateral triangle is 18cm, the height is 3.6cm, what is its area in cm**2.
等边三角形的周长是18cm，高是3.6cm，它的面积是多少cm**2．
<gadget id="calculator">18 / 3</gadget>
<output>6</output>

<gadget id="calculator">3.6 / 2</gadget>
<output>1.8</output>

<gadget id="calculator">6 * 1.8</gadget>
<output>10.8</output>

<result>10.8</result>