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Verified answer
Luas kolam= (phi) (r)^2
= (3,14) (25)^2
= 3,14 × 625
= 1.962,5 m^2
luas kolam + jalan
= (phi) (r)^2
= (3,14) (25+5)^2
= (3,14) (30)^2
= 3,14 × 900
= 2.826 m^2
Luas jalan
= luas (kolam + jalan) - luas kolam
= 2.826 - 1.962,5
= 863,5 m^2
biaya minimum membeli keramik
= Rp50.000 × 863,5
= Rp 43.175.000