Respuesta :

Answer:

x = ~8.9

Step-by-step explanation:

a^2 + b^2 = c^2

c is the long side

a and b are the other two shorter sides

this means

x^2 + 19^2 = 21^2

x^2 + 361 = 441

x^2 = 441- 361

x^2 = 441- 361

x^2 = 80

square root of 80 = ~8.9

x = ~8.9

chetankachana

Answer:

8.9

Step-by-step explanation:

[tex]4\sqrt{5}[/tex]=8.9444

rounded = 8.9

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