Uncle Wang’s home has a trapezoidal orchard, the upper base is 300 meters, the lower base is 500 meters, and the height is 75 meters. How many hectares is this orchard?
王大爷家有一个梯形果园地，上底是300米，下底是500米，高是75米．这块果园地有多少公顷？
<gadget id="calculator">300 + 500</gadget>
<output>800</output>

<gadget id="calculator">75 / 2 / 10_000</gadget>
<output>3/800 = around 0.00375</output>

<gadget id="calculator">800 * (3/800)</gadget>
<output>3</output>

<result>3</result>