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2a ( ramiona trójkąta)
4a + 1-----------> podstawa
obw= 2* 2a + 4a + 1
obw = 4a + 4a +1
obw = 8a + 1
II przypadek
4a + 1----------- > ramiona
2a----------------->podstaw
obw = 2 * ( 4a + 1) + 2a
obw= 8a + 2 + 2a
obw = 10 a+ 2