Answer:

Step-by-step explanation:
observe

The supplement of 30° is the angle that when added to 30° forms a straight angle (180° ).
3 times x equals to 646
3x=646
Answer:
ASA
Step-by-step explanation:
in the place that I have put some marks on it, they have the same angle; so then they will also have the same third angle; and for the rest you should use ASA.