Respuesta :

Answer:

21

Step-by-step explanation:

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

(20)^2 + (7)^2 = [tex]c^{2}[/tex]

400 + 49 = [tex]c^{2}[/tex]

c= [tex]\sqrt{449}[/tex] = 21.1 ~ 21

(hope its right)

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