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h = ?
P = 20
a = 16
20 = 1/2 * 16 * h
20 = 8 * h /: 8
h = 2,5
Wysokość ma 2,5 cm
czyli ½×16×x=20
x=8×x=20
x=20:8
x=2.5 P=½×16×2.5=20 Mam nadzieje ze pomoglem pzdr.:0