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5² + y² = 10²
25 + y² = 100
y² = 75 /√
y = 5√3
z = 5√3 - 5
5² + 5² = w²
w² = 50 /√
w = 5√2
Ob = 10 + 5√2 + 5√3 - 5 = 5 + 5√2 + 5√3 = 5 ( 1 + √2 + √3 )
Rysunek z oznaczeniami w załączniku.