7cm because if the mm was 5 or over then it would be closer to 8cm but it is lower than 5 so it is closer to 7cm.
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Circumference of the circle: 2*pi*7 = 44 cm rounded up to the nearest whole number
1 cm = 10 mm 2 cm = 2 x 10 mm = 20 mm
There are 10 mm in a cm, so 8 cm in equivalent to 80 mm. 80 mm / 2 mm = 40. Therefore, 8 cm is 40 times as long as 2 mm.
1 cm = 10 mm 2 cm = 20 mm . . . 9 cm = 90 mm 10 cm = 100 mm 20 cm = 200 mm 30 cm = 300 mm
10 mm = 1 cm 20 mm = 2 cm 30 mm = 3 cm . . 70 mm = 7 cm