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jadi <AOC = 2 X <ABC
x = 2y
y = abc
= m-n
x = aoc
untuk membuktikannya :
aob = 180 - 2m
cob = 180 - 2n
aod = 180 - (180-2m)
= 180 -180 +2m
= 2m
cod = 180 - cob
= 180 - (180-2n)
= 180-180+2n
= 2n
aoc = cod - aod
x = 2n - 2m
x = 2 ( n-m)
x = 2 (y)
x = 2y