If the base of a triangle is 40 meters and the height is 10 meters, what is the area in square meters?
一个三角形的底是40米，高是10米，面积是多少平方米．
<gadget id="calculator">10 / 2</gadget>
<output>5</output>

<gadget id="calculator">40 * 5</gadget>
<output>200</output>

<result>200</result>