A trapezoidal forest has an upper base of 150 meters, a lower base of 210 meters, and a height of 65 meters. What is the area of the trapezoidal forest?
一片梯形的树林，它的上底是150米，下底是210米，高是65米，这个梯形树林的面积是多少？
<gadget id="calculator">150 + 210</gadget>
<output>360</output>

<gadget id="calculator">65 / 2</gadget>
<output>65/2 = around 32.5</output>

<gadget id="calculator">360 * (65/2)</gadget>
<output>11_700</output>

<result>11_700</result>