The area of a parallelogram is 72 square centimeters, and the base of a triangle with the same base and height is 18 centimeters, what is the area of the triangle?
一个平行四边形的面积是72平方厘米，与它等底等高的三角形的底是18厘米，则三角形的面积是多少．
<gadget id="calculator">72 / 2</gadget>
<output>36</output>

<result>36</result>