Yes it is a ratio. The simplified ratio is 2:1 but 4:2 might be used too.
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1:4 1 to 4
It is: 4 to 10
The ratio of the circumference of a circle with radius 4 cm to its area is 1:2.
ratio = 80% : 20% or 80 : 20 ot 8 : 2 or 4 : 1
4 to 15