The perimeter of an equilateral triangle is 18cm, the height is 4.8cm, what is its area in cm**2.
等边三角形的周长是18cm，高是4.8cm，它的面积是多少cm**2．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">18 / 3</gadget>
<output>6</output>

<gadget id="calculator">(1/2) * 6 * 4.8</gadget>
<output>14.4</output>

<result>14.4</result>