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a = ½π - bok rombu
r = ? promień okręgu
1. Obliczam obwód rombu
O₁ = 4*½π =2π
O₂ = 2πr - obwód koła
O₂= O₁
2πr = 2π /:2π
r = 1
b) prostokąt o bokach długości 3 i π .
a = 3
b = π
O₁ = 2a +2b obwód prostokąta
O₁ = 2*3 + 2*π = 6 + 2π
O₂ = 2πr - obwód koła
O₂= O₁
2πr = 6 + 2π /:2
πr = 3 +π
r = (3+π) :π
r = 3:π +π:π
r = 3:π +1