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a₁*h₁ = a₂*h₂
18cm*5cm = 15cm*h₂
90cm² = 15cm*h₂
15cm*h₂ = 90cm² |:15cm
h₂ = 6cm
b= 15
h1=5
h2=?
P=18 x 5
P= 90
h2= 90 : 15
h2= 6
spr.: 18 x 5 = 90
15 x 6 = 90
90 = 90