tentukan volume bangun gabungan

ada 3 bangun ruang
1. limas segi empat
2. kubus
3. kerucut

1. dik
alas = 70cm
tinggi limas = 30cm

V. limas = ⅓×L.alas×T.limas
= ⅓×70×70×30
= 4900×10
= 49000cm³

2. dik
sisi = 70cm

V. kubus = s³
= 70×70×70
= 343000cm³

3. dik
jari jari = 21cm
tinggi kerucut = 30cm

V. kerucut = ⅓πr²t
= ⅓×22/7×21×21×30
= 22×3×21×10
= 66 × 210
= 13860cm³

V. gabungan
49000 + 343000 + 13860
= 405860cm³

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