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Diket r=3,5 cm
massa jenis bola= 20
Dit m 90 bola??
Jawab
Volume 1 bola besi
πr³=xx(3,5)³
=
= 16170 cm³
massa 90 bola besi = massa jenis bola besi × volume 90 bola besi
= 20 × 16170
= 323400 gr
= 323,4 kg
Nomor 15
L = 4πr²
6,16 = 4××r²
r² = 0.49
r = 0.7