SOLUTION: ∠100° is supplementary to which of the following angles?

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Question 1137048: ∠100° is supplementary to which of the following angles?
Answer by ikleyn(52803) About Me  (Show Source):
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180° - 100° = 80°.     ANSWER

Supplementary angles are those that sum up to 180°.

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On supplementary angles, see my lessons
    - Angles basics
    - HOW TO solve problems on supplementary, complementary or vertical angles - Examples
in this site.

Also,  you have this free of charge online textbook on Geometry
    GEOMETRY - YOUR ONLINE TEXTBOOK
in this site.

The referred lesson is the part of this online textbook under the topic
"Basics of angles. Supplementary, complementary angles. Vertical angles. Parallel lines".

Save the link to this online textbook together with its description

Free of charge online textbook in GEOMETRY
https://www.algebra.com/algebra/homework/Triangles/GEOMETRY-your-online-textbook.lesson

to your archive and use it when it is needed.