Why does the interior angle measures of a triangle equal 180 degrees?

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The interior angle measure of all triangles equals 180 degrees. Why?
In this video, I show you why. You start with a circle, draw a diameter which equals 180 degrees. Next, draw two parallel lines which create transversal and angles that are equal.

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  2. triangle
  3. interior angle measure
  4. why does the interior angle measures triangle equal 180 degrees?
  5. geometry
  6. math
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Комментарии
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2 and 4 are alternate interior angles, not 2 and 5. Same goes for 3 and 5.

armendemirchyan
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You Proof is nice, but you are wrong in one thing....2 and 4 are alternate interior angles, not 2 and 5

yanivsinder
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Love the video with the exception of that interior angles glitch. 2&4 and 3&5 are the correct pairs of alt. int. angles. I like that you made it so simple and short, but its hard to share this video or reference it with that bit of potential confusion.

marcolsen
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Thanks for stopping by moomoomath and science. Why does the interior ngle measure of a triangle always equal 180 degrees?

MooMooMath
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2 & 4 are alternate interior angles. smh

palashbundele