What is the measure of angle 3?
1

129

Step-by-step explanation:

Every angle would be similar to each other with having only TWO different degrees...

Each line ( <> ) equals 180 (never 360, b/c that would be a circle)

Now with you only having 51 as a degree, you need to do 180-51 which gives you 129, with that given, this tells you number 1 and 3 is both 129, and angle 2 is 51.

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