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Reika [66]
3 years ago
12

Please help me. Please....

Mathematics
1 answer:
Nadusha1986 [10]3 years ago
8 0

Answer:

20

Step-by-step explanation:

1/2(a+b)=180

1/2(6+12)=18

1/2(18)=180

9/9=180/9

=20

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