The base of a triangle is 7.2 decimeters, the height is half of the base, what is the area?
一个三角形的底是7.2分米，高是底的一半，面积是多少．
<gadget id="calculator">7.2 / 2</gadget>
<output>3.6</output>

<gadget id="calculator">3.6 / 2</gadget>
<output>1.8</output>

<gadget id="calculator">7.2 * 1.8</gadget>
<output>12.96</output>

<result>12.96</result>