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f= 15cm
a= bok rombu
Obw= 4a
robimy trójkąt prostokątny o przyprostokątnych ½e oraz ½f
(½e)² + (½f)² = a²
(4cm)² + (7,5cm)² = a²
16cm² + 56,25cm² = a²
a= √16cm²+56,25cm²
a=√72,25cm²
a=8,5cm²
Obw= 4 × 8,5cm = 34cm