The upper base of a trapezoidal orchard is 600 meters, the lower base is 1200 meters, and the height is 500 meters. How many hectares is the area of this orchard?
一个梯形果园的上底是600米，下底是1200米，高是500米．这个果园的面积是多少公顷？
<gadget id="calculator">600 + 1_200</gadget>
<output>1_800</output>

<gadget id="calculator">500 / 2 / 10_000</gadget>
<output>1/40 = around 0.025</output>

<gadget id="calculator">1_800 * (1/40)</gadget>
<output>45</output>

<result>45</result>