If the area of a parallelogram is 45 square decimeters, what is the area of a triangle with the same base and height?
如果平行四边形的面积是45平方分米，那么和它等底等高的三角形的面积是多少．
<gadget id="calculator">45 / 2</gadget>
<output>45/2 = around 22.5</output>

<result>45/2 = around 22.5</result>