The perimeter of an equilateral triangle is 15 cm and the height is 4.4 cm. What is the area of the triangle?
一个等边三角形的周长是15厘米，高是4.4厘米，这个三角形的面积是多少？
<gadget id="calculator">15 / 3</gadget>
<output>5</output>

<gadget id="calculator">4.4 / 2</gadget>
<output>2.2</output>

<gadget id="calculator">5 * 2.2</gadget>
<output>11</output>

<result>11</result>