Everything, since they are one.
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All their angles are less than 90 degrees.
No, but all equilateral triangles are acute. Acute: All angles of the triangle are less than 90 degrees. Equilateral: All angles of the triangle are 60 degrees.
Aren't all equilateral triangles acute??
All equilateral triangles are acute triangles, since all the angles are less than 90 degrees.
Equilateral triangles have only acute angles ti be equal to each other