сечение-ромб со стороной
x^2=a^2+(a/2)^2=5a^2/4
x=0.5a√5
P=4x=2a√5
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сечение-ромб со стороной
x^2=a^2+(a/2)^2=5a^2/4
x=0.5a√5
P=4x=2a√5