Did the Egyptians Use an Architect Scale Ruler to Build the Great Pyramid?

Some perplexing questions about pyramids:

1. Did the Egyptians build pyramids?
2. If so, why did the Egyptians build pyramids?
3. Why did they stop building pyramids?
4. How did they build them?
5. Did they use an architect scale ruler to read their blueprints?

   

We consider the architect scale ruler to be a modern tool for engineers and planners. But since the Egyptians were so far advanced, why not assume that they used this modern tool, also?