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B + C = 180⁰ - A
B + C = 180⁰ - 30°
B + C = 150°
2C + C = 150°
3C = 150° /:3
C = 50°
B = 2 * 50° = 100°
A = 30
B+C = 150
B = 2C
2C+C = 150
C = 50
B = 150 - C
B =100