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= 180 ÷ 3 = 60 (A)
A = 2/3.(90-A)
A = 2/3.90 - 2/3.A
A = 60 - 2/3A
A+2/3A = 60
3/3A+2/3A = 60
5/3A = 60
A = 60 : 5/3
A = 60 x 3/5
A = 36˚ ....(C)