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d= a√2
d = 5m√2
d = 7,1m = 71 dm
2. korzystamy z twierdzenia Pitagorasa
A. a²+b² = c²
2²+3² = 5²
4 + 9 = 25
13 = 25 fałsz
B. a²+b² = c²
3²+4² = 7²
9 + 16 = 49
25 = 49 fałsz
C.a²+b² = c²
1²+3² = √10²
1 + 9 = 10
10 = 10 jest prostokątny
D. a²+b² = c²
5²+6² = 7²
25 + 36 = 49
61 = 49 fałsz