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luas lubang = 20 cm x 25 cm
= 500 cm²
= 0,05 m²
luas 45 lubang = 0,05 m² x 45
= 2,25 m²
luas tanah yang tidak dibuat lubang :
Luas tanah - luas lubang = 250 m² - 2,25 m²
= 247,75 cm²
= 250m - 22500 cm
= 250m - 2,25m
=247,5m