Odpowiedź:
a - bok rombu
o - obwód rombu = 4a = 25 1/5 cm
4a = 25 1/5 cm = 126/5 cm
a = 126/5 cm : 4 = 126/20 cm = 6 6/20 cm = 6 3/10 cm lub 6,3 cm
Obw = 25,2
Obw = 4a
25,2 = 4a /:4
a = 6,3
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Odpowiedź:
a - bok rombu
o - obwód rombu = 4a = 25 1/5 cm
4a = 25 1/5 cm = 126/5 cm
a = 126/5 cm : 4 = 126/20 cm = 6 6/20 cm = 6 3/10 cm lub 6,3 cm
Odpowiedź:
Obw = 25,2
Obw = 4a
25,2 = 4a /:4
a = 6,3