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1000 mm = 1 m so 70 mm = 70/1000 = 0.07 metres. Simple!
According to ISO 216, A1 is 841 mm x 594 mm. This is approx 33.1 inches x 23.4 inches = 774.54 sq inches.
10 mm = 1 cm 20 mm = 2 cm 30 mm = 3 cm . . 70 mm = 7 cm
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One cm contains 10 mm. So, 7 x 10 = 70 mm.