1. Meaningful parts means words that make sense; words you can understand. Flagpole would become flag and pole.
2. What does flag mean? A piece of cloth, usually rectangular, of distinctive color and design, used as a symbol, standard, signal, or emblem. What does pole mean? A long, cylindrical, often slender piece of wood, metal, etc.
3. A symbolic cloth on a pole, or meant to be on a pole, would be called flagpole.
4. Use these steps and summarize them in your own words.
Hope this helps!