Answer:
R = 11
C ≈ 69.12
A ≈ 380.13
Step-by-step explanation:
R = d ÷ 2
C = 2πr
A = 2πr²
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5th year= 9800
1st year=15800
2nd=14300
3rd=12800
4th=11300
5th=9800