The perimeter of an equilateral triangle is 18 cm and the height is 3.6 cm. What is its area in square centimeters?
一个等边三角形的周长是18厘米，高是3.6厘米，它的面积是多少平方厘米？
<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>