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3 years ago

13

HELP 50 POINTS NOW HELP HELP HELP HLEP

1 answer:

koban [17]3 years ago

3 0

Answer:

a=42°

b=138°

Step-by-step explanation:

the sum of angles on a triangle is 180°

so

18+120+a=180

138+a=180

a=180-138

a=42

a+b=180 because a ans b are linear pair of angles.

Definiton:A linear pair of angles is formed when two lines intersect. Two angles are said to be linear if they are adjacent angles formed by two intersecting lines. The measure of a straight angle is 180 degrees, so a linear pair of angles must add up to 180 degrees.

a=42 from before

it means that b=180-42=138

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