The upper base of a trapezoid is 2.4 meters, 2.6 meters shorter than the lower base, and the height is 3 meters. If it is made into a parallelogram, how many square meters of triangles should be added?
一个梯形的上底是2.4米，比下底短2.6米，高是3米，如果把它补成一个平行四边形，需补上多少平方米的三角形．
<gadget id="calculator">3 / 2</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">2.6 * (3/2)</gadget>
<output>3.9</output>

<result>3.9</result>