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|AC|= 5
|BC|= 6
|AB|= c
a)
a²+b²= c²
5²+6²= c²
25+36= c²
c²= 61
c= √61
b)
Ob.= a+b+c
Ob.= 5+6+√61= 11+√61 (j)
c)
P= 1/2·a·b
P= 1/2·5·6= 1/2·30= 15 (j²)