Respuesta :

Let's use the exterior angle theorem here, which states that the sum of two opposite interior angles is equal to the sum of the exterior angle.

Therefore, we have:

x + 19 = 66

Let's solve for x.

Subtract 19 from both sides:

x + 19 - 19 = 66 - 19

x = 47°

ANSWER:

x = 47°