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π = 3,14
L = 4 π r²
5024 = 4 . 3,14 . r²
5024 = 12,56 . r²
r² = 5024/12,56
r² = 400
r = 20 cm
4πr² = 5024
4 x 22/7 x r² = 5024
r² = 5024 x 7/22 x 1/4
r² = 228 x 7 x 1/4
r² = 57 x 7
r²= 399 cm
maaf kalo salah