Respuesta :

alex3245
The sum of the interior angles can be represented by:
180(n-2)
180 x 2 = 360
Therefore, the sum of the angles must be 360.

56 + 97 + 136 = 289
360 - 289 = 71°

Hope I helped!
Ckaranja
Angles of a quadrilateral add up to 360 degrees. Thus;
360-(56+97+136)
=71°