If the base of a parallelogram is 10 decimeters and the height is 8 decimeters, what is the area of the triangle with the same base and height?
一个平行四边形的底是10分米，高是8分米，与它等底等高的三角形的面积是多少平方分米．
<gadget id="calculator">8 / 2</gadget>
<output>4</output>

<gadget id="calculator">10 * 4</gadget>
<output>40</output>

<result>40</result>