A triangle of a parallelogram has the same base and height. It is known that the area of the parallelogram is 36cm**2. What is the area of the triangle in cm**2?
一个平行四边形的一个三角形等底等高，已知平行四边形的面积是36cm**2，这个三角形的面积是多少cm**2．
<gadget id="calculator">36 / 2</gadget>
<output>18</output>

<result>18</result>