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|DF|-wysokość
P=|AB|*|DE|=|BC|*|DF|
|DF|=|DE|*|AB|/|BC|
|DF|=15*30/18
|DF|=450/18
|DF|=25
Odp.Wysokość |DF| wynosi 25
P=30·15
P=450 [m²]
P=|DF|·|BC|
450=|DF|·18
|DF|=450:18
|DF|=25 [m]