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10 : 2 = 5 - wysokośc dzieli bok "a" na połowy
b² = 5² + h₂
13² = 25 + h²
169 = 25 + h²
169 - 25 = h²
h² = 144
h = 12
h₂ = h₃
h * a : 2 = h₂ *b : 2
12 * 10 : 2 = h₂ * 13 : 2
60 = h₂ * 6,5
h₂ = 60 : 6,5
h₂ ≈ 9, 23
h₃ ≈ 9,23
P = 12 * 10 : 2 = 60