TV screen dimensions

A calculated 65-inch 16:9 screen is 56.7 in143.9 cm wide and 31.9 in80.9 cm high.

That is screen geometry, not the outside of a television. Fractions such as 56 3/4 are accepted in the inch field.

Fractions such as 56 3/4 are accepted. This is the screen diagonal, not the cabinet.

16:9 is the default. 4:3 and 21:9 are screen-only presets, not cabinet shapes.