If the area of a parallelogram is 18 square centimeters, what is the area of a triangle with the same base and height in square centimeters?
一个平行四边形的面积是18平方分米，与它等底等高的三角形面积是多少平方厘米．
<gadget id="calculator">18 / 2</gadget>
<output>9</output>

<gadget id="calculator">9 * 100</gadget>
<output>900</output>

<result>900</result>