All triangles have 3 sides and 3 interior angles that add up to 180 degrees and are classed as follows:-
Scalene triangle
Obtuse triangle
Right angle triangle
Isosceles triangle
Equilateral triangle
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classifying quadrilaterals mean you give the shape a name.
All isosceles triangles are not equilateral triangles
Yes all equilateral triangles are acute triangles, but not all acute triangle are equilateral triangles.
That the triangles will be congruent
Three triangles.