Xiaodong is 1.4 meters tall, and his shadow length is 1 meter standing on the playground. At the same time, the shadow length of the teaching building was measured to be 7 meters. How tall is the teaching building? (Solve with ratio)
小东身高1.4米，站在操场上他的影长是1米．同时测得教学楼的影长是7米，教学楼有多高？(用比例解)
<gadget id="calculator">1.4 * 7</gadget>
<output>9.8</output>

<result>9.8</result>