The measurement team wanted to measure the height of a tree, and the shadow of the tree was measured to be 12.6m long, and a nearby upright bamboo pole with a length of 2m was 1.2m long. How tall is the tree in meters? (Solution by proportional method)
测量小组要测量一棵树的高度，量得树的影子长12.6m，附近一根长2m的直立竹竿，影子长1.2m．这棵树的高度是多少米？(用比例方法解)
<gadget id="calculator">1.2 / 2</gadget>
<output>0.6</output>

<gadget id="calculator">12.6 / 0.6</gadget>
<output>21</output>

<result>21</result>