По теореме Пифагора
[tex]A_{1}B^2=8^2+12^2=208\\AB^2=9^2+208=289\\AB=17[/tex]
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По теореме Пифагора
[tex]A_{1}B^2=8^2+12^2=208\\AB^2=9^2+208=289\\AB=17[/tex]