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Maka:
Luas seluruhnya = 1,6 m × 2 m = 3,2 m²
Luas kolam ikan = 1 m × 70 cm = 1 m × 0,7 m = 0,7 m²
Luas tanah yang ditanami rumput = 3,2-0,7 = 2,5 m²