If the base of a parallelogram is 5.5 meters and the height is 4 meters, what is the area in square meters of a triangle with the same base and height?
一个平行四边形的底是5.5米，高是4米，与它等底等高的三角形的面积是多少平方米．
<gadget id="calculator">4 / 2</gadget>
<output>2</output>

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

<result>11</result>