No 3 dan 4 tolong ya

3.)

luas kamar = 4m × 3m = 12m = 1200 cm2
1200 ÷ 40 = 30 keramik

4.)

luas trapesium = 1/2 × (60+20) × 45 = 1800cm2
1800cm2 = 1

4m = 400 cm
3m = 300cm
luas kamar = p×l = 400×300= 120000
luas keramik
=s×s
= 40×40=1600
keramik yg dibutuhkan
120000:1600=75 keramik

luas trapesium
=½×(20+60)×45
=½×80×45
=1800
Uang yg diterima
125000×1800 = 225000000

semoga bener,, maaf kalau salah