First we have to know that the total size a outer angle with its inner angle equals to 180.
Outer angle 1 = 92
180 - 92 = 88 = Inner angle 1
Outer angle 2 = 123
180 - 123 = 57 = Inner angle 2
And as long as we know two of the inner angles we can use the to solve for them third one.
So,88 + 57 = 145 = 180 - 145 = 35
The angle no.3 = 35
Angle no.4 = 180 - 35 = 145
NOTE: I answered the first problem in another question. HOPE THAT HELPS.
