The angles used for mitering three decorative shapes that work well as borders are: Pentagon (five sides): 54 degrees. Hexagon (six sides): 60 degrees. Octagon (eight sides): 67 1/2 degrees.

The app indicated a near zero, 0.2 degree, angle so we knew we had a problem because the app calls for no more than a 2-degree difference in U-joint angle and 5.8 – 0.2 = 5.6 degrees.

The Bent Pyramid at Dahshur was built for pharaoh Snefru about 2,600BC, and was originally designed as a "true" pyramid with the steep 54-degree angle. Image source, EPA But the pyramid was being ...

The Bent Pyramid at Dahshur was built for pharaoh Snefru about 2,600BC, and was originally designed as a "true" pyramid with the steep 54-degree angle.