Take the 4dm long line segment as the common side, draw two triangles with heights of 6dm and 8dm on both sides, what is the area of this combined figure dm**2.
以4dm长的线段为公共边，在两侧分别画出高是6dm和8dm的两个三角形，这个组合图形的面积是多少dm**2．
<gadget id="calculator">6 / 2</gadget>
<output>3</output>

<gadget id="calculator">4 * 3</gadget>
<output>12</output>

<gadget id="calculator">8 / 2</gadget>
<output>4</output>

<gadget id="calculator">4 * 4</gadget>
<output>16</output>

<gadget id="calculator">12 + 16</gadget>
<output>28</output>

<result>28</result>