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What type of triangle has all sides equal in length?

  1. Isosceles

  2. Obtuse

  3. Scalene

  4. Equilateral

The correct answer is: Equilateral

An equilateral triangle has all sides equal in length, making it the only type of triangle that fulfills the given criteria. Option A, isosceles, has two equal sides but not all sides are equal. Option B, obtuse, has one angle that is greater than 90 degrees, but it does not guarantee all sides to be equal in length. Option C, scalene, has no equal sides, therefore it does not have all sides equal in length.