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OpenStudy (anonymous):
Help? A1 + A2 + A3 = 180 for A1 a. A1 = 180 - A2 - A3 c. A1 = 180 + A2 +A3 b. 180 + A2 + A3 = A1 d. 180 - A2 + A3 = A1
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OpenStudy (anonymous):
the correct answer is A part
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