The size of fillet is represented by the radius of arc, and the original angle is replaced by an arc tangent to both sides of the angle, and the size of fillet is represented by the radius of arc. Today, with more and more exquisite web design, the application of rounded corners has become more and more extensive.
Rounded corner patent: Apple's previous patents on iPhone and iPad will contain some practical functions more or less, such as Home button, back contour design or integral glass cover design of front panel. But the patent obtained this time only describes the appearance design of a device, with rectangular rounded corners.