Cut out the largest triangle from a parallelogram paper with a base of 9 cm and a height of 6 cm. What is the area of this triangle in square centimeters?
从一个底是9厘米，高是6厘米的平行四边形纸上剪下一个最大的三角形，这个三角形的面积是多少平方厘米．
<gadget id="calculator">6 / 2</gadget>
<output>3</output>

<gadget id="calculator">9 * 3</gadget>
<output>27</output>

<result>27</result>