Answer :

apologiabiology
since they are all paralell
1=4=5=8=9=12
2=3=6=7=11=10
2=129=
since that is a straignth line
2+4=180
4=12
2+12=180
subsitue
129+12=180
subtract 129 from both sdies
12=51

the answer is A 51
brittneec5493

Answer:

since they are all paralell

1=4=5=8=9=12

2=3=6=7=11=10

2=129=

since that is a straignth line

2+4=180

4=12

2+12=180

subsitue

129+12=180

subtract 129 from both sdies

12=51

Step-by-step explanation:

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