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b=15 cm
h=2/3a
(1/2a)²+(2/3a)²=15²
1/4 a²+4/9 a²=225
9/36 a²+16/36 a²=225
25/36 a²=225
a²=225*36/25
a= √225*36/25
a=15*6/5
a=3*6
a=18 cm
obw=18+2*15
obw=18+30
obw=48 cm