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Which shape does not have any right angles or obtuse angles?

  1. Acute Triangle

  2. Obtuse Triangle

  3. Scalene Triangle

  4. Right Triangle

The correct answer is: Acute Triangle

The correct choice is an acute triangle, which is defined as a triangle where all of its interior angles are less than 90 degrees. This characteristic means it does not contain any right angles (which are exactly 90 degrees) or obtuse angles (which are greater than 90 degrees). By focusing strictly on the angles of an acute triangle, you understand that all three angles must always be acute themselves, maintaining the overall property of having no right or obtuse angles. This quality makes the acute triangle unique in the context of the other triangle types listed, which either contain obtuse or right angles, thereby excluding them from the category of shapes with only acute angles.