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What are Acute, Obtuse, and Right Triangles?

What are acute, obtuse, and right triangles?

Summary

  1. The little box in triangle 3 means that angle is a right angle
  2. An acute angle is an angle that is less than 90 degrees
  3. The 'm' and sideways 'V' mean 'the measurement of angle...'
  4. An obtuse angle is an angle that measures between 90 and 180 degrees
  5. A triangle can never have more than one obtuse angle
  6. A right angle is an angle that measures exactly 90 degrees
  7. A triangle can never have more than one right angle

Notes

    1. Remember, an acute angle is always less than 90 degrees!
    1. Remember, an obtuse angle is an angle that measures between 90 and 180 degrees
    2. A triangle can never have more than one obtuse angle
    3. The three angles in a triangle always add to 180 degrees
    4. So if one angle is greater than 90 degrees, the sum of the other two can't be more than 90 degrees
    1. Remember, a right angle is an angle that measures exactly 90 degrees
    2. A triangle can never have more than one right angle
    3. The three angles in a triangle always add to 180 degrees
    4. So if one angle equals 90 degrees, the sum of the other two must be 90 degrees