It is an area - something takes up a space that is 50 centimetres in length and 40 centimetres in width. (It is a rectangular space).
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The long diagonal will be sqrt(7500) cm = 86.60 cm (to 2 dp)
50cm
50cm is 1/2 of 1meter
50 cm = 19.6850 "
500mm = 50cm