Respuesta :

devishri1977

Answer:

Step-by-step explanation:

x + 87 + 20 = 180           {Angle sum property of triangle}

          x + 107 = 180

                 x = 180 - 107

                x = 73

1) Exterior angle of a triangle equals the sum of opposite interior angles or remote angles.

2) x = 63 + 86

  x = 149