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Obw = 4a
a² = P
P = 5²/2
P = 25/2
P = 12,5
a = √12,5
a = 3,5 (około)
4*3,5 = 14
O ile dłuższy jest bok kwadratu o przekatnej 10 od boku o przekątnej 8?
P₁ = 10²/2
P₁ = 100/2
P₁ = 50
50 = a₁²
a₁ = 5√2
P₂ = 8²/2
P₂ = 64/2
P₂ = 32
32 = a₂²
a₂ = 4√2
a₁ - a₂ = 5√2 - 4√2 = √2