find the value of the unknown
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o= 180-117= 63 degree
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angle(AOD) = angle(BOC). (vertically opp ang)
a + 30 + 40 = 117
=> a + 70 = 117
=> a = 47
a + 30 + 40 = 117
=> a + 70 = 117
=> a = 47
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