Jawab ya kakak kakak yangg pakar

1a.20×15×18×1/3=1800cm3
1b.18×18×32×1/3=3456cm3
1c.35×24×15×1/3=4200cm3

2a.luas ○
22/7×jari2×jari2=22/7×7×7=154cm2
volume
154×20=3080cm3×1/3=1026,67

2b.luas ○
3,14×jari2×jari2=3,14×10×10=314cm2
volume
314×18=5652cm3×1/3=1884cm3

2c.luas○
22/7×jari2×jari2=22/7×10,5×10,5=346,5cm2
Volume
346,5×24=8316×1/3=2772cm3

Jawaban:
1.a.Volume=1/3 × p × l × t.
=(1/3 × (20 × 15 × 18))cm^3.
=(1/3 × 5.400)cm^3.
=1.800 cm^3.
b.Volume=1/3 × s × s × t.
=(1/3 × (18 × 18 × 32))cm^3.
=(1/3 × 10.368)cm^3.
=3.456 cm^3.
c.Volume=1/3 × p × l × t.
=(1/3 × (35 × 24 × 15))cm^3.
=(1/3 × 12.600)cm^3.
=4.200 cm^3.
2.a.Volume=1/3 × phi × r × r × t.
=(1/3 × (22/7 × 7 × 7 × 20))cm^3.
=(1/3 × 3.080)cm^3.
=1.026,667 cm^3.
b.Volume=1/3 × phi × r × r × t.
=(1/3 × (3,14 × 10 × 10 × 18))cm^3.
=(1/3 × 5.652)cm^3.
=1.884 cm^3.
c.Volume=1/3 × phi × r × r × t.
=(1/3 × (22/7 × 10,5 × 10,5× 24))cm^3.
=(1/3 × 58.212)cm^3.
=19.404 cm^3.