1:500
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Convert the km to mm, then the units can be removed and the ratio found: 1 m = 1,000 mm 1 km = 1,000 m = 1,000 x 1,000 mm = 1,000,000 mm ⇒ 1 mm : 50 km → 1 mm : 50 x 1,000,000 mm → 1 mm : 50,000,000 mm → 1 : 50,000,000
If the circle has a RADIUS of 1mm then about 3,14 mm2 If the circle has a DIAMETER of 1mm then about 0,785 mm2
1mm
1mm to 1cm.
1/10 or 0.1 cm