mili16
mili16 mili16
  • 13-07-2017
  • Mathematics
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This question please

This question please class=

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musiclover10045
musiclover10045 musiclover10045
  • 13-07-2017

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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