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Q: Is an equilateral triangle always or never similar to a scalene triangle?

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For any triangle, be it 'Scalene, Equilateral, Isosceles, Right-angled', the sum of the interiod angles is ALWAYS 180 degrees.

the sum of the internal angles of a triangle, no matter whether isosceles, equilateral or scalene, is always 180 degrees

Never

Equilateral triangles have all sides and angles equal, isosceles triangles have two sides and angles equal, and scalene triangles have no sides or angles equal. In other words, equilateral triangles are a special case of isosceles triangles, and isosceles triangles are a special case of scalene triangles.

No. An isosceles has two equal sides and two equal angles. A scalene has no equal sides and no equal angles.

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For any triangle, be it 'Scalene, Equilateral, Isosceles, Right-angled', the sum of the interiod angles is ALWAYS 180 degrees.

The definition of an obtuse triangle is a triangle with an angle exceeding 90o. A scalene triangle is a triangle in which no two sides are of equal length. Therefore, it is possible that an obtuse triangle is a scalene triangle. However, it is also possible for an obtuse triangle to be an isosceles, in which two sides are of equal length. On a final note, it is impossible for an obtuse triangle to be an equilateral; equilateral triangles always have angles of 60o.

the sum of the internal angles of a triangle, no matter whether isosceles, equilateral or scalene, is always 180 degrees

Never

Sometimes similar but it depends

A scalene triangle. In a scalene triangle, there are no congruent sides or angles. In an isosceles triangle, at least two congruent sides and angles. In an equilateral triangle, all three sides and angles are congruent, with angles that always measure sixty degrees. Note: an equilateral triangle also classifies as an isosceles triangle, as it meets the definition of an isosceles triangle mentioned above.

Equilateral triangles have all sides and angles equal, isosceles triangles have two sides and angles equal, and scalene triangles have no sides or angles equal. In other words, equilateral triangles are a special case of isosceles triangles, and isosceles triangles are a special case of scalene triangles.

No. A scalene triangle is never isosceles. An isosceles triangle has two equal sides. A scalene triangle has none.

No. An isosceles has two equal sides and two equal angles. A scalene has no equal sides and no equal angles.

No.

An equiangular triangle is always equal. A scalene triangle does not have to have any equal sides. Therefore an equiangular triangle in never scalene.

The scalene triangles are weird because they are defined by what they aren't. The inside angles of a scalene triangle are always all different. If all three angles are different, then the triangle is scalene, and all the sides are different lengths. Imagine two angles are the same. The triangle would then be an Isosceles triangle, which has two sides the same length. If all three angles are the same, it would be an equilateral triangle and all three sides would be the same length.