B. acute scalene
C. obtuse isosceles
D. right scalene
The one which is not an appropriate classification for a triangle is right equilateral. Hence, option A is correct.
The basic polygonal shape of a triangle has three sides & three interior angles. This is one of the fundamental shapes in geometry and is particularly associated. It has three connected vertices. Triangles can be divided into various categories according to their sides and angles.
As per the given data in the question,
A right-angle triangle can not be an equilateral triangle.
The reason behind this is straightforward, for an equilateral triangle all sides should be the same and the internal angles are equal to 60° but in the case of the right-angled triangle there must be an angle of 90° and one side should be greater than the other two sides that's why it follows the Pythagoras's property.
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