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Khafre Pyramid 3-4-5 triangle geometry creates the bridge,
between the tetrahedral square root two geometry,
and the golden rectangle geometry of phi and inverse phi.

The bridge <---
is the angle -- y -- the Corner Angle of the Khafre Pyramid.
Once angle -- y -- becomes the pyramid construct of corner angle geometry,
the Side Face Angle -- K, is produced,
and then tested,
in isosceles triangle geoemtry -- as the Apex Angle of that isosceles triangle.

The fundamental Khafre Pyramid  3-4-5  triangle geometry,
upper left side of the image.
Side Face Angle -- K 
Corner Angle -- y -- and refer back to the last posted image,
{Khafre Octahedral}
for corner angle --y, 
being found from the tetrahedral geometry of the Mars Cydonia hexad.

On the upper right hand side of the image:
the Side Face Angle -- K,
is tested in an isosceles triangle --- as the full Apex Angle.
The resultant geometry,
reveals the -- inverse phi angle tangent -- of the golden rectangle,
angle -- z1,
as the angle that evenly bisects -- the two isosceles triangle -- base angles.

Bottom left side of image:
displays how the Isosceles triangle dissasembles into the Khafre Pyramid Side Face Angles,
or you can view the process in reverse <---

Bottom right hand side of the image:
expands the geometry within the isosceles triangle, 
to show the Phi tangent angle,
and the redistribution of angles as the geometry replicates to the apex.
Note angle W <---

This is why the Khafre Pyramid ... simple 3-4-5 triangle geometry,
is actually more complex and important than that implied simplicity.
The direct transformation from tetrahedral to phi and inverse phi geometry,
is well displayed by the Khafre Pyramid interface,
in this post, and the last post on Cydonian mound geometry.
It is also another reason that the Cydonia mounds,
most definitely need a Mars rover visit, 
with a strong visit to The Face.