Respuesta :

Answer:

19.42.

Step-by-step explanation:

[tex]a^{2} + b^{2} =c^{2}[/tex]

All you need to remember is the slant(hypotenuse) is always c.

Onoriodefelix

Answer:

x = 19.42

Step-by-step explanation:

x^2 = 21^2 - 8^2

= 441 - 64

= 377

x = squareroot of 377

x = 19.42

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