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Luas = π × r²
= 3,14 × 0,35 ×0,35
= 0,38 cm³
Jadi, berat 1 buah bola besi adalag 0,38cm³.
Maka:
0,38 cm³ × 200 bola besi = 76 cm³
1 cm³ bola besi = 7,8 gram
Maka:
76cm³ × 7,8 gram = 592,89 gram
Mohon maaf bila ada kesalahan