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Can someone please help me these find the questions to these,, it's super confusing. There are 3 questions

Can someone please help me these find the questions to these,, it's super confusing-example-1
User Peril
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Answer:

Explanation:

area of a circle = πr²

= 3.14×21²=3.14×441=1384.74cm²

User JulCh
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