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a) 6²+5²=BA²
36+25=BA²
61=BA²
BA=√61
B) (7.5)²+AB²=(12,5)²
56.25+AB²=156.25
AB²=100
AB=10
C) (√11)²+AB²=5²
11+AB²=5²
AB²= √14
|ab|²=61
|ab|=√61
b)12,5²-7,5²=156,25-56,25=100
√100=10
c)5²-√11²=25-11=14
√14