The base of a triangle is 5 meters and the height is 0.8 meters, what is its area in square meters
一个三角形的底是5米，高是0.8米，它的面积是多少平方米
<gadget id="calculator">0.8 / 2</gadget>
<output>0.4</output>

<gadget id="calculator">5 * 0.4</gadget>
<output>2</output>

<result>2</result>