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P = 40
d₁ = 10
40 = 10 * d₂*½
d₂ = 8
Z pitagorasa można obliczyć bok. Bierzesz połówki przekątnych :)
a - bok
4²+5²=a²
16+25=a²
a=√41
Ob=4*a
Ob=4√41