Zadanie
Ob. = 21 cm
2n + 1 - I bok trójkąta
2n + 3 - II bok trójkąta
2n + 5 - III bok trójkata
2n + 1 + 2n + 3 + 2n + 5 = 21
6n + 9 = 21 l -9
6n = 12 l :6
n= 2
2n + 1 = 2 · 2 + 1 = 5 cm - I bok
2n + 3 = 2 · 2 + 3 = 7 cm - II bok
2n + 5= 2 · 2 + 5 = 9 cm - III bok
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Zadanie
Ob. = 21 cm
2n + 1 - I bok trójkąta
2n + 3 - II bok trójkąta
2n + 5 - III bok trójkata
2n + 1 + 2n + 3 + 2n + 5 = 21
6n + 9 = 21 l -9
6n = 12 l :6
n= 2
2n + 1 = 2 · 2 + 1 = 5 cm - I bok
2n + 3 = 2 · 2 + 3 = 7 cm - II bok
2n + 5= 2 · 2 + 5 = 9 cm - III bok