Tolong dibantu nomer 18 dan 19, Terimakasih

18.
1 = 3,14 x 6cm x 6cm x 5cm = 565,2cm3
2 = 3,14 x 3cm x 3cm x 12cm = 339,12cm3
3 = 3,14 x 3cm x 3cm x 8cm : 3 = 75,36cm3
Total = 565,2cm3 + 339,12cm3 + 75,36cm3 = 979,68cm3

19.
1 = 22/7 x 0,7cm x 0,7cm x 5cm = 7,7cm3
2 = 22/7 x 0,7cm x 0,7cm x 2,4cm : 3 = 1232cm3
Total = 7,7cm3 + 1232cm3 = 1239,7cm3

Maaf kl salah dmg agak ribet angkanya...

Mapel : Matematika.
Kelas : 6 SD.
Materi : Bangun Ruang Gabungan.

Saya jawab yaa

18. r = 12 ÷ 2
= 6 cm
V. Tabung bawah = πr² × t
= 3,14 × 6² × 5
= 3,14 × 36 × 5
= 113,04 × 5
= 565,2 cm³
V. Tabung tengah = 3,14 × 3² × 12
= 3,14 × 9 × 12
= 28,26 × 12
= 339,12 cm³
V. Kerucut = ⅓ π r²
= ⅓ × 3,14 × 3² × 8
= ⅓ × 3,14 × 9 × 8
= ⅓ × 3,14 × 9 × 8
= 3,14 × 3 × 8
= 9,42 × 8
= 75,36 cm³
V. keseluruhan = 525,2 + 339,12 + 75,36
= 979,68 cm³ (d)

19. r = 1,4 ÷ 2
= 0,7 cm
V. Tabung = 22/7 × 0,7² × 5
= 22/7 × 0,49 × 5
= 22 × 0,7 × 5
= 15,4 × 5
= 77 cm³
V. Kerucut = ⅓ × 3,14 × 0,7² × 2,4
= ⅓ × 3,14 ×0,49 × 2,4
= 3.69264 ÷ 3
= 1.23088
V. keseluruhan = 77 + 1.23088
= 78.23088 cm³ (Pilih aja jawaban terdekat) jawaban : b