Find the measure of
The missing angles

Step-by-step explanation:

Given

Angle =57°

So by linear property of the angles 57°+c=180°

c=180°-57°

c=123°

Angle c is 123°

Angle b=angle c (opposite angle)

angle b 123°

this may not be at all, but i use the same website you're using for school, and if i'm stuck doing one of these i try to look for it on the section.