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P trójkąta =
Ob kwadratu = 4a = a+a+a+a
P kwadratu = a² = a*a
Ob prostokąta 2a + 2b = a+a+b+b
Ob rombu = a+b+c+d
P rombu =
Ob równoległoboku = 2a+2b = a+a+b+b
P równoległoboku a*h