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x = 24
b)
a² + b² = c² gdzie : b² = H²
czyli:
6² + H² = 8²
36 + H² = 64 / - 36
H² = 28
H = 2√7
c)
a² + b² = c²
a² + 8² = 12²
a² + 64 = 144 /-64
a² = 80
a = 4√5
x = 4√5