What is the area of an equilateral triangle whose perimeter is 18 cm and height is 3 cm?
一个等边三角形的周长是18厘米，高是3厘米，它的面积是多少．
<gadget id="calculator">18 / 3</gadget>
<output>6</output>

<gadget id="calculator">3 / 2</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">6 * (3/2)</gadget>
<output>9</output>

<result>9</result>