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b = dłuższa podstawa
P = (a + b) * h : 2 |*2
2P = (a + b) * h |:h
2P : h = a + b |-a
2P : h - a = b
2)
wiemy, że średnica to 2 promienie
Ob = 2 πr |:2π
Ob : 2π = r |*2
2(Ob : 2π) = 2r