Question

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Answer 1

see answer below.

Explanation:

So m∠1= 40, as given in the question.

We should already know that a straight line, or angle, is equal to 180°

Knowing that it is equal to 180°, to find the angle of ∠3, you can subtract 40 from the 180°

180°-40°= 140°

answer: m∠3= 140°

Answer 2

angle 3 is 140°

Explanation:

angle 2 and angle 3 are equal

angle 4 and 1 are also equal

angle 3 =

180-40= 140

angle 3 is 140