Two identical triangles are put together to form a parallelogram with an area of 8.6cm**2, what is the area of one of the triangles in square centimeters?
两个完全一样的三角形，拼成一个面积是8.6cm**2的平行四边形，其中一个三角形面积是多少平方厘米．
<gadget id="calculator">8.6 / 2</gadget>
<output>4.3</output>

<result>4.3</result>