They are triangles with 3 equal sides and 3 equal interior angles or triangles that are congruent in shape
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No Equilateral triangles are triangles that have all of its three sides the same exact measurement. This means that if all the sides are the same then all of the interior angles will equal the same. And they always equal 60 degrees in an equilateral triangle. Equivalent traingles are just traingles that are equal in size and angles to another triangle equal. Equivalent traingles can be equilateral but they do not have to be.
All isosceles triangles are not equilateral triangles
Triangles may be right triangles equilateral triangles acute or obtuse triangles
there are 27 triangles in a triangle
depends on what size triangles and what kind of triangles?