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  1. Learn what a 180-degree angle is, how to draw it with a protractor or a compass, and see real-life examples of this straight angle. Find worksheets, practice questions, and FAQs on 180-degree angles.

  2. Learn what a 180 degree angle is, how to draw it using a protractor or a compass, and how it relates to other angles. Find out the facts, examples, and practice problems on 180 degree angle.

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  3. A 180 degree angle is the measurement of an angle when the sides are on opposite sides of the vertex, and on form a straight line. A straight angle’s vertex angle is 180° in measure. Here, ∠AOB = 180°. ∠AOB can therefore be considered to be a straight angle.

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  4. Learn how to use parallel lines, transversals, and corresponding angles to prove that the sum of the interior angles of a triangle is 180°. Watch a video, read a transcript, and see questions and tips from other learners.

    • 4 min
    • Sal Khan
  5. A straight angle is 180 degrees. This is a straight angle. A straight angle changes the direction to point the opposite way. Sometimes people say "You did a complete 180 on that!" ... meaning you completely changed your mind, idea or direction.

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  7. 3 days ago · Learn what a 180 degree angle is, how to draw it, and its properties. Find out the types of angles, such as reflex, straight, adjacent, and supplementary angles, and see solved examples.

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