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P = ah / 2
a = 12 cm = 1,2 dm
1,2 dm * h / 2 = 60 dm² /*2
1,2 dm * h = 120 dm² /:1,2 dm
h = 120 / 1,2 = 1200 / 12 = 100 dm
Odp: Wysokość opuszczona na ten bok ma 100 dm.