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a+b+c=14
a²+b²+c² =72
a²+b²=c²
to
a²+b²=36
c²=36
p=1/2*14=7
a+b+c=14
a²+b²+c²=72
c²+c²=72
c²=36
c=6
p=7
r=p-c
r=7-6=1
P=1*7=7