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Ob=40 cm
d₁=3x
d₂=4x
Szukane:
P=?
Rozwiązanie:
½d₁=1,5x
½d₂=2x
4a=40
a=40:4
a=10cm
a²=(1,5x)²+(2x)²
10²=2,25x²+4x²
100=6,25x²
x²=100:6,25
x²=16
x=4
d₁=3×4
d₁=12cm
d₂=4×4
d₂=16cm
P=½×12×16
P=96cm²
Odp:Pole rombu wynosi 96cm² .