Respuesta :

Answer: 156°

Step-by-step explanation:

As you know angle sum of a quadrilateral = 360°

So, 3x + 5x + 9x + 13x = 360°

Or, 30x = 360°

Or, x = 12°

Hence: 3x = 36°, 5x = 60°, 9x = 108° and 13x = 156°