W załączniku.
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W załączniku.
P₂=π*(½d)²=π*(½a√2)²=½a²√2π
P=P₁+P₂
48π=¼a²π+(½a√2)²π
48π=¼a²π+½a²π
48π=¼a²π+²/₄a²π
48π=¾a²π
¾a²=48
a²=64
a=8