Discussion

Explanation:

Area of the original paper = π(20)2 = 400π cm2. The total cut portion area = 4(π)(5)2 = 100π cm2 . Therefore, area of the uncut (shaded) portion = (400 – 100) = 300π cm2.
Hence, the required ratio = 300π : 100π = 3 : 1.

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