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r = 6,5 dm
Dit : Ls ?
Jawab :
L lingkaran = π r²
= 3,14 . 6,5 . 6,5
= 132,665dm
Lp = Ls + L lingkaran
438,815 = Ls + 132,665
Ls = 438,815 - 132,665
= 306,15dm²