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abruzzese [7]
3 years ago
11

:)Answer in simplest radical form.(and show work please)

Mathematics
1 answer:
rodikova [14]3 years ago
3 0

Answer:

Step-by-step explanation:

Use Pythagorean theorem,

Base² + altitude² =hypotenuse²

x² + 19² = 21²

x² + 361 = 441

         x² = 441 - 361

          x² = 80

          x =\sqrt{80}=\sqrt{2*2*2*2*5}=2*2*\sqrt{5}=4\sqrt{5}

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