The area of a parallelogram is 45cm**2, what is the area of a triangle with the same base and height?
一个平行四边形的面积是45cm**2，与它等底等高的三角形面积是多少．
<gadget id="calculator">45 / 2</gadget>
<output>45/2 = around 22.5</output>

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