The radius of the curvature for the display CRT (cathode ray tube) used in the Macintosh 5200CD family* of computers is 3.94 feet. The dimensions are as follows:
Screen Height: 213.0 mm
Screen Width: 284.0 mm
Screen Diagonal: 351.0 mm
*The following computers are in the Macintosh 5200CD family: Macintosh 5200/75 LC, Performa 5200, Performa 5210, Performa 5215, and Performa 5220.