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P=1/2 * a*b
a=7
P=49
49=1/2*7*b
b=14
1/2 * 7 * h = 49
3,5h = 49 / : 3,5
h = 14
Druga z przyprostokątnych ma 14 cm.
Teraz podstawiasz swoje dane
1/2*7*b=49 /*2
7*b=98
b=98/7
b=14