Respuesta :

Answer: 8.3 in.

Steps:
a^2 + b^2 = c^2
a^2 + 18.2^2 = 20^2
a^2 + 331.24 = 400
a^2 = 400 - 331.24
a^2 = 68.76
a = 8.29
a = 8.3