Respuesta :

1. tanA = 12 / 25 = 26.

2. radius = 38.4 / 2 = 19.2.
    14.7^2 + b^2 = 19.2^2 => b = 12.4, by pythagorean theorem.
    Finally, x = 19.2 - 12.4 = 6.8.