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Sagot :
Answer:
m4=m1+m2
Step-by-step explanation:
m1+m2+m3=180
m3+m4=180
m3=180-m4
m1+m2+(180-m4)=180
m1+m2=m4
I also did this and im not sure if im right but i got A for the answer so i think its the first one
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