Respuesta :

StellarStephanie
The answer is B. 29. You use Pythagorean theorem to figure this out.
20^2 + 21^2 = 29^2

Answer:

29

Step-by-step explanation:

a^2 + b^2 = c^2

21^2 + 20^2 =c^2

441+400 = [tex]\sqrt{841} = 29[/tex]