Q: Equilateral triangles must also be

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Yes. But not all isosceles triangles are equilateral.

Yes.

Equilateral triangles have angles that all equal 60 degrees. Acute triangles all have an angles that are less than 90 degrees.

All equilateral triangles are acute triangles, since all the angles are less than 90 degrees.

False.

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Yes. But not all isosceles triangles are equilateral.

No

Yes.

Generally not

Equilateral triangles have angles that all equal 60 degrees. Acute triangles all have an angles that are less than 90 degrees.

No...

All isosceles triangles are not equilateral triangles

All isosceles triangles are not equilateral triangles

Since triangles have three sides and must have interior angles equal to pi or 180o, the three interior angles in all equilateral triangles will be pi/3 or 60o.However, equilateral triangles must also have equal side lengths. Since equilateral triangles with interior angles of 60o will not necessarily have the same side lengths, two equilateral triangles will sometimes be similar to each other.

Yes all equilateral triangles are acute triangles, but not all acute triangle are equilateral triangles.

All equilateral triangles are acute triangles, since all the angles are less than 90 degrees.

True