Question

Jawab dengan jalannya ya kak

Answer 1

AB : PQ = DC : SR = DA : SP = CB : RQ
30 : 18 = 18/30 = 0.6
SR = DC × 0.6 = 20 × 0.6 = 12
Tinggi kolam = DE × 0.6 = 15 × 0.6 = 9

Keramik yang di butuhkan = Trapesium besar - Trapesium kecil
= (½ × (alas + atap) × Tinggi(Trapesium besar) - (½ × (alas + atap) × Tinggi(Trapesium kecil))
= (½ × (30+20)×15) - (½ × (18+9)×9)
= (½ × 50 ×15) - (½ × 27 ×9)
= (25 ×15) - (13.5 × 9)
= 375 - 121.5
= 253.5
= 253.5m² ÷ (20cm×10cm)
=253.5 m² ÷ (200cm²)
=253.5m² ÷ 2m²
= 126.75 (di bulat kan )
=12.000 D