DETAILED NOTES ON ONE UP MULTIVERSE

The "foundation radius" of a round cone may be the radius of its base; usually this is actually called the radius with the cone. The aperture of a right round cone is the most angle among two generatrix strains; Should the generatrix tends to make an angle θ on the axis, the aperture is twoθ. In optics, the angle θ is known as the 50 %-angle on