From a circular sheet of paper with r...

From a circular sheet of paper with radius 20 cm, four circles of radius 5 cm each are cut out. What is the ratio of the uncut to the cut portion? (a) 1 : 3 (b) 3 : 1 (c) 4 : 1 (d) 4 : 3

`1: 3 `

`4: 1 `

`3 : 1`

`4 : 3`

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