please help me !!!
ignore the green tab but that's also the option and please answer
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Step-by-step explanation:
it's 80° answer. we can do this by exterior angle theory
Answer:
80 degree
Step-by-step explanation:
Given: angle ABC =40
angleACD =120
To find: angle A
Solution: angle ACB + angle ACD=180 degree....pair of linear angles
angle ACB + 120 = 180
angle ACB =180-120
angle ACB =60
angle A + angle B + angle C= 180 degree....sum of angles of triangle
angle A + 40 + 60 = 180
angle A =180-100
angle A = 80 degree