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3x + 3x + 6x = 90
12x = 90
x = 7,5cm
7,5cm x 2 = 15cm
krawędź podstawy ma 7,5cm a krawędź boczna 15cm
Licze na najlepsze:).
30cm:2=15cm.
30cm.-15cm=15cm.
15cm:2=7,5 cm.
u podstawy: 7.5cm.
boki-15cm.