С А (3x – 15°) 105° B. 1057 D x Brus. - Is
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Answer:
40°
Step-by-step explanation:
The total angle formed at a line is 180°
105°+0 = 180°
o = 180° - 105° = 75°
o = 75°
o+ ( 3x - 15°) = 180°
75° + 3x - 15 ° = 180°
3x = 180°- 60°
3x = 120°
x = 40°
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