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30/360 πr² = 3π
r² = 36
r = 6
b)
240/360 πr² = 3/2π
2/3 r² = 3/2
r² = 9/4
r = 3/2
c)
72/360 πr² = 2π
1/10 r² = 2
r² = 20
r = 2√5