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sudut OAB = 42 derajat
sudut ABO = 42 derajat
sudut AOB = 180 -( 42 +42)
= 180 - 84
= 96 derajat
sudut AOB + COB = 180 derajat
96 + COB = 180
COB = 180 -96
= 84 derajat