A parallelogram with an area of 30m**2 and a triangle with the same low and equal height, what is the area of the triangle in m**2?
一个面积是30m**2的平行四边形和一个三角形等低等高，三角形的面积是多少m**2．
<gadget id="calculator">30 / 2</gadget>
<output>15</output>

<result>15</result>