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morpeh [17]
3 years ago
8

This question please

Mathematics
1 answer:
AlexFokin [52]3 years ago
3 0

19^2 + x^2 = 21^2

19^2 = 361

21^2= 441

361 + x^2 = 441

x^2 = 441-361 = 80

x = sqrt(80) = 8.944 round to nearest tenth = 8.9

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