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Classify angles

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Learn it Acute: less than 90°. Right: exactly 90°. Obtuse: between 90° and 180°. Straight: exactly 180°.

Example: What kind of angle is this?

  1. Compare it with a right angle (a square corner).
  2. It opens wider than 90° but is not a straight line.
  3. It is obtuse (about 125°).

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