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P = 1/2 * 8 * 5
P= 1/2 * 40cm2
P= 20cm2
P = 1/2 * a * h /*2
2P = a* h / :a
2P/a = h
h = 40cm2 / 6cm
h = 6,(6)7cm
Druga wysokość wynosi 6,(6)7 cm