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A 35 mm margin means 35 mm on both sides, for a total of 70 mm, so subtract 70 mm from the dimension of interest to learn how wide you can make your crest.21.5 cm = 215 mm215 mm - 70 mm = 145 mm or 14.5 cmYou can make something 14.5 cm wide.
1000 mm = 1 m so 70 mm = 70/1000 = 0.07 metres. Simple!
10 mm = 1 cm 20 mm = 2 cm 30 mm = 3 cm . . 70 mm = 7 cm
16 x .25.4 mm/in = 406 mm
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