Final answer:
The three solid bars on the Korean flag when hung vertically are located in the upper left corner. They are known as Geon, one of the four Trigrams that symbolize heaven, and are part of the elements depicted on the flag.
Step-by-step explanation:
When the Korean flag is hung vertically, the three solid bars, known as part of the Trigrams which represent heaven, are located in the upper left corner. Each Trigram on the Korean flag has a specific meaning and placement that symbolizes balance and principles of yin and yang. The three solid bars, specifically, are called Geon, one of the four Trigrams collectively called 'Gwe', which represent different elements and concepts of life.