The ancient Egyptians built pyramids using a combination of sophisticated engineering techniques, skilled labor, and simple tools. Here's a detailed explanation of the pyramid construction process:

Site Preparation

1. Surveyors chose a suitable site with a stable foundation, typically on the west bank of the Nile4.
2. The site was carefully oriented to align with the cardinal directions using astronomical observations4.
3. Workers excavated and leveled the foundation to within 2 centimeters of perfect level4.

Quarrying and Transporting Materials

1. Limestone blocks were quarried from nearby sites, often just south of the pyramid location6.
2. Large blocks were cut using copper chisels and bronze saws3.
3. Stones were transported on wooden sleds pulled by workers1.
4. To reduce friction, the path was wetted with water or oil, allowing the sleds to slide more easily16.

Construction Techniques

The pyramid was built from the bottom up, using one of several proposed methods:

Ramp Method

1. A large ramp was constructed leading up to the current level of the pyramid1.
2. As the pyramid grew taller, the ramp was extended and raised10.
3. Blocks were pulled up the ramp using a system of pulleys1.

Internal Ramp Theory

Some scholars propose an internal ramp of ascending squares was used to lift blocks to the top1.

Lever Method

1. Blocks were moved level by level using a series of levers1.
2. Each block was tied to two levers, one on each side.
3. Workers pressed the levers to the ground, raising the blocks.
4. The levers were then rotated to move the blocks further up the pyramid1.

Tools and Measurements

1. Workers used copper pickaxes, chisels, granite hammers, and dolerite tools1.
2. The royal cubit (52.5 cm) was used as a standard unit of measurement to ensure accuracy1.
3. Plumb bobs were employed to maintain vertical alignment3.

Construction Process

1. The core of the pyramid was built with lower-quality limestone blocks1.
2. Finer white limestone was used for the outer casing and interior walls1.
3. Blocks were set in place using levers and ropes1.
4. A gypsum mortar was used to settle blocks into place and fill gaps1.
5. The pyramid was built in stages, with the outer layers added last4.

Workforce and Timeline

1. Skilled workers, not slaves, constructed the pyramids6.
2. An estimated 20,000 to 30,000 workers were involved in the construction10.
3. The Great Pyramid of Giza took approximately 20 years to complete10.

While these methods are widely accepted, some aspects of pyramid construction remain debated among Egyptologists. Recent discoveries, such as the ramp system found at the Hatnub quarry, continue to provide new insights into the ingenious techniques employed by ancient Egyptian builders6.