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|AC|=|BD|
|AC| = |AB| + |BC|
|BD| = |BC| + |CD|
czyli
|AB| + |BC| = |BC| + |CD|
19 = |BC| + |CD| - |BC|
19 = |CD|
|CD| = 19 cm
|CE| = 97cm
|CE| = |CD| + |DE|
czyli
|CD| + |DE| = 97
|DE| = 97 - |CD|
|DE| = 97 - 19 = 78 cm
Odp. Długość odcinka DE wynosi 78 cm.