∠AOB = 110° and ∠BOC = 70°; they share vertex O, share arm OB, and do not overlap, so they are adjacent supplementary angles., True, False, ∠AOB = 85° and ∠BOC = 85°; they are supplementary angles., True, False, Two angles share a common arm and a common vertex; this means they are automatically supplementary., True, False, ∠AOB = 120° and ∠BOC = 60°; if ∠AOB decreases by 20°, then ∠BOC must increase by 20° so their sum is still 180°., True, False, ∠AOB = 115° and ∠BOC = 65°; if both angles decrease by 5°, their total measure will still be 180°. —, True, False, If two adjacent angles form a straight angle, they must always have the same measure., True, False, ∠AOB = 80° and ∠BOC = 100°; if the smaller angle increases by 15°, the larger angle must decrease to 85°., True, False
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