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L = 1/2*4*3,14*10*10
1/2*4*3,14*100
1/2*4*314
2*314
L = 628 cm bujursangkar
Lb = 3π r²
Lb = 3 x 3,14 x 10²
Lb = 9,42 x 100
Lb = 942 cm²