Respuesta :

(5 - 2) x 180 = 540 = sum of interior angles in pentagon
180 - 42 = 138°
180 - 80 = 100°
110 + 100 + 138 + 2x + x = 540
348 + 3x = 540
- 348
3x = 192
÷ 3
x = 64°