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

The Great Pyramid and Sphinx
The Great Pyramid and Sphinx

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?

    Architect Scale Ruler
    Architect Scale Ruler

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?