The application scenario of this patent is really too wide. Of course, it can also be said that the figures in the patent drawings limit this patent to devices with a specific aspect ratio, so that tablet computers of other sizes and proportions can still not infringe.
Given the circumferential angle α and the chord length A of the circumferential angle, the radii r, 2r = a/sinα and r = a/2sinα can be obtained by using the sine theorem.
Extended data:
In a cylindrical coordinate system, there is a selected reference axis and a selected reference plane perpendicular to the axis. The starting point of the system is the point where all three coordinates can give zero. This is the intersection between the reference plane and the axis.
This axis is called a cylindrical axis or a longitudinal axis to distinguish it from light rays on the reference plane (starting from the origin and pointing in the reference direction).
The distance from the axis can be called radial distance or radius, while angular coordinates are sometimes called angular position or azimuth. Both the radius and the azimuth * * * are called polar coordinates because they correspond to a two-dimensional polar coordinate system in a plane parallel to the reference plane. The third coordinate can be called height or height (if the reference plane is considered horizontal), longitudinal position or axial position.
In a spherical coordinate system, the radius represents the distance between a point and a fixed origin. If we further reach the zenith from the position where the polar angle and azimuth angle measured between the radial direction and the fixed zenith direction are orthogonal (that is, the angle between orthogonal projections on the reference plane passing through the origin), and fix the reference direction on this plane.
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