A rectangular residential land is 12 meters long and 75 meters wide. How many hectares does this residential land have?
一块长方形的住宅用地，长12米，宽75米，这块住宅用地有多少公顷．
<gadget id="calculator">12 * 75</gadget>
<output>900</output>

<gadget id="calculator">900 / 10_000</gadget>
<output>9/100 = around 0.09</output>

<result>9/100 = around 0.09</result>