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a²+b²=c²
a²+16=25
a²=9
a=3
P=1/2*3*4=6[j²]
Ob=2*3+2*4=14
b)a²+b²=c²
9²+b²=15²
b²=225-81=144
b=12
P=9*12=108[j²]
Ob=18+30=48
c)
h²+b²=c²
h²+8²=10²
h²=100-64=36
h=6
P=(a+b)h:2
P=15+7)6:2
P=66[j²]
Ob=15+8+10+6=39