On a map with a scale of 1:10000, the length of the school playground is 0.9 cm and the width is 0.6 cm. What is the actual area of the school playground in square meters?
在比例尺是1：10000的地图上，量得学校操场的长是0.9厘米，宽为0.6厘米，学校操场的实际面积是多少平方米．
<gadget id="calculator">1 / 10_000</gadget>
<output>1/10_000 = around 0.0001</output>

<gadget id="calculator">0.9 / (1/10_000) / 100</gadget>
<output>90</output>

<gadget id="calculator">0.6 / (1/10_000) / 100</gadget>
<output>60</output>

<gadget id="calculator">90 * 60</gadget>
<output>5_400</output>

<result>5_400</result>