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Need help finding the circumstance and area of the 2 circle

Need help finding the circumstance and area of the 2 circle-example-1
User EliasM
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the first one is a circumference of 50.3 and an area of 20.1mm{2} then the second one is a circumference of 20.1 cm and area of of 32.2 cm{2}
User Michy
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