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wzor na pole powierzchni prostopadloscianu to
P = 2(ab + bh + ha)
tutaj
a = 12m
b = 6m
h = 5m
P = 2(12m*6m + 6m*5m +5m*12m) =
= 2(72m² + 30m² + 60m²) = 2(102m² + 60m²) = 2 * 162m² =
= 324m²
Ta stodola ma 324m² powierzchni.