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x-wysokość drzewa
x/1,65m= 12m/2,1m
z proporcji
19,8m=x*2,1m
x=około 9,43m
2,1m- 1,65m
12m*1,65m/2,1m= 19,8m²/2,1m=9,(428571)m≈9,5m
x - 12 m
x = 12m x 1,65m / 2,1m
x = ok. 9,4 m
Odp. To drzewo ma wysokość 9,4 m