To measure the height of a tree, the length of the shadow of the tree is 8.4 meters. At the same time, a 2-meter-long pole is erected on the ground, and the length of the shadow is 1.2 meters. How many meters is the height of the tree?
要测量一棵树的高度，量得树的影子长度是8.4米，同时用一根2米长的标杆直立在地面上，量得影子长度是1.2米，这棵树高是多少米？
<gadget id="calculator">2 / 1.2</gadget>
<output>1.666667</output>

<gadget id="calculator">1.666667 * 8.4</gadget>
<output>14.000003</output>

<result>14.000003</result>