If the perimeter of an equilateral triangle is 1.5 decimeters and the height is 6 centimeters, what is its area?
一个等边三角形的周长是1.5分米，高是6厘米，它的面积是多少．
<gadget id="calculator">1.5 * 10</gadget>
<output>15</output>

<gadget id="calculator">15 / 3</gadget>
<output>5</output>

<gadget id="calculator">6 / 2</gadget>
<output>3</output>

<gadget id="calculator">5 * 3</gadget>
<output>15</output>

<result>15</result>