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a=b
c=a√2
r=(2a-a√2)/2
2a+a√2=4
a(2+√2)=4
a=4/(2+√2) = 4(2-√2)/(4-2) = 4-2√2
c=(4-2√2)*√2 = 4√2-4
r=[2(4-2√2)-(4√2-4)]/2 = (8-4√2-4√2+4)/2 = (12-8√2)/2
r=6-4√2
II sposob
P=r*p
p=4/2=2
r=P/2
r=1/2*(4-2√2)²/2 = 1/4*(16-16√2+8) = 1/4(24-16√2)=6-4√2
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