The base of a triangle is 5.5 meters, the height is 4 meters, what is the area in square meters?
一个三角形的底是5.5米，高是4米，面积是多少平方米．
<gadget id="calculator">4 / 2</gadget>
<output>2</output>

<gadget id="calculator">5.5 * 2</gadget>
<output>11</output>

<result>11</result>