The options are:
m∠1+m∠2=m∠4
m∠1=m∠2
m∠5=m∠1+∠m∠3
m∠4=m∠6
The 1st statement is true. Any of the other two angles that are not the third angle equal to the supplement of the third angle. So angle 1 and 2 add up to be equal to angle 4, which is angle 3's supplement.
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