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A
C B
a)
|AB|²= 6²+5²
|AB|²=36+25
|AB|²= 61
|AB|=√61
B)|AB|²=12,5²+ 7,5²
|AB|²= 156,25+ 56,25
|AB|²= 212,5
|AB|= 5√8,5
ale tego drugiego nie jestem pewna :(:(