Ring with outer and inner radius: ring area as a share of the full circle

The same question, asked 2 times: 12 Sep 2025 S1*, 13 Sep 2025 S2. Every wording below, oldest first.

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Question 1
12 Sep 2025 S1
72 $A ring-shaped disc has outer radius 10 cm and inner radius 7 cm. What is the approximate ratio of the ring’s area to the whole outer circle?$
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Question 2
13 Sep 2025 S2
71 $A ring-shaped metallic sheet has outer and inner radii 10 cm and 6 cm. What percentage of the full circle's area is the ring?$
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