The base of a parallelogram is 40 cm and the height is 20 cm. What is the area of the triangle with the same base and height?
一个平行四边形的底是40厘米，高是20厘米，与它等底等高的三角形的面积是多少平方分米
<gadget id="calculator">20 / 2 / 100</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">40 * (1/10)</gadget>
<output>4</output>

<result>4</result>