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The Great Pyramid of Giza Has More Than Four Sides, Research Reveals It’s a 'Concave Octagonal Pyramid'
This marvel is a result of the structure's construction ... "In other words, the Great Pyramid is a concave octagonal pyramid ...
BBC8mon
The concrete blocks that once protected Britain
"When I originally arrived at the cliff's edge, the sun was creating a harsh shadow down the face of the concave which wouldn't have done the structure any justice'" says Pettet-Smith. "I knew it ...