I hope this will help you solve problems in the future.
Step-by-step explanation:
The angle of a flat line is 180 degrees. To find the angle of the corner right of 79 degrees, you can subtract 104 from 180. This tells you what the remaining angle is. The corner would be 76 degrees. Now if you subtract 79, and 76, from 180, you will find the angle of corner 1. All three inner angles of a triangle will always add up to 180 degrees! Good luck!
