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b=4 [j]
P=ef/2
P=12 [j²] pole rombu
a²= (e/2)² +(f/2)²
a²=(3/2)² +4/2)² =9/4 +16/4 =25/4
a=√(25/40
a=5/2 [j]
P=ah
h=P/a
h=12*2/5
h=4,8 [j]
r=1/2 h
r=2,4 [j]
Pk=πr²
Pk=2,4²π
Pk=5,76π [j²]
P/Pk=12/(5,76π)
P/Pk=1200/(576π)
P/Pk=25/(12π) stosunek pól