Question

please help me !!!
ignore the green tab but that's also the option and please answer​

Answer 1

Step-by-step explanation:

it's 80° answer. we can do this by exterior angle theory

Answer 2

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