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b=12√2
R=c/2
c²=a²+b²
c²=(4√2)²+(12√2)²
c²=32+288
c²=320 =64*5
c=8√5
R=8√5/2
R=4√5
P=πR²
P=(4√5)²π
P=16*5π
P=80π [j²]