a=7
b=(40-2*7):2=(40-14):2=26:2=13
2*7=14
40-14=26
26/2=13
Dłigość drugiego boku to 13 cm
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a=7
b=(40-2*7):2=(40-14):2=26:2=13
2*7=14
40-14=26
26/2=13
Dłigość drugiego boku to 13 cm