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a²+b²+c²=338
c²+c²=338/:2
c²=169
c=13
a+b=17 ⇒ b=17-a
a²+b²=169
a²+(17-a)²=169
a²+(17-a)²=144+25
a=12
b=5
P=1/2*5*12=30
1/2*13*h=30
h=30: 6,5
h=30*2/13
h=60/13