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<AOB + <ABO + <OAB = 180°
5/2 <ABO + <ABO + 90° = 180°
7/2 <ABO = 180°-90°
7/2 <ABO = 90°
<ABO = 90° x 2/7
<ABO = 180/7 °
<ABO ≈ 25,714°