Respuesta :

ven22514

Answer:

57°

Step-by-step explanation:

Given line is straight line

then whole angle is 180°

then 180 - 123 = a = 57

Answer:

  • 57°.

Step-by-step explanation:

What we know is:

  • One angle is 123°.

We don't know:

  • angle a°.

So, we add both angles up to 180°:

  • 123 + a = 180.

Lets solve 180 - 123:

  • 180 - 123
  • = 57
  • a° = 57°.

Angle a° is 57°.