Q: Are an isosceles and a scalene triangle always similar?

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Never

It doesn't matter if a triangle is isosceles, scalene, obtuse, acute... There are always 3 angles in a triangle (which add up to 180).

No, those are two different types of triangles. An isosceles triangle has two sides of the same length and one side of different length; a scalene triangle has three sides which are all of different length.

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

no

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

Never

It doesn't matter if a triangle is isosceles, scalene, obtuse, acute... There are always 3 angles in a triangle (which add up to 180).

No, those are two different types of triangles. An isosceles triangle has two sides of the same length and one side of different length; a scalene triangle has three sides which are all of different length.

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

no

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

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.

This triangle is called a scalene triangle.

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.

Sometimes similar but it depends

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.