Respuesta :

fieryanswererft

Answer:

x = 14°

Step-by-step explanation:

All the interior angles of the triangle sum up to 180°

Therefore:

2x + 11° + 51° + 90° = 180°

2x + 152° = 180°

2x = 180° - 152°

2x = 28°                   [ divide both sides by 2 ]

x = 14°

Solution:

Note that:

  • Angles of triangles: (2x + 11)°, 51°, 90°
  • 2x + 11 + 51 + 90 = 180

Simplify the equation and solve for x.

  • 2x + 11 + 51 + 90 = 180
  • => 2x + 152 = 180
  • => 2x = 28
  • => x = 14