If the area of a parallelogram is 280 square centimeters, what is the area of a triangle with the same base and height as it?
一个平行四边形的面积是280平方厘米，与它的等底等高的三角形的面积是多少平方厘米．
<gadget id="calculator">280 / 2</gadget>
<output>140</output>

<result>140</result>