Cut a trapezoid into a parallelogram and a triangle. The upper base of the trapezoid is 6cm, the lower base is 10cm, and the height is 5cm. What is the area of the cut triangle?
把一个梯形剪成一个平行四边形和三角形，梯形的上底是6cm，下底是10cm，高是5cm，剪得的三角形的面积是多少．
<gadget id="calculator">10 - 6</gadget>
<output>4</output>

<gadget id="calculator">5 / 2</gadget>
<output>5/2 = around 2.5</output>

<gadget id="calculator">4 * (5/2)</gadget>
<output>10</output>

<result>10</result>