It impossible for a triangle to have three acute angles.
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What?
A triangle most certainly can have three acute angles. Such a triangle would be called an acute-angled triangle!
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An acute angled triangle.
Regular, Acute, and Equilateral * * * * * Regular and Equilateral are correct but not Acute. An acute triangle with angles of 50,60 70 degrees for example, is not regular. An equiangular triangle is the third possible name.
Acute scalene triangle
For one thing, it's an "acute triangle" because all three of its angles are acute. But in the very special case where all three angles are 60 degrees each, the triangle's sides are also all the same length, and that characteristic is the root of it's name. It's called an "equilateral" triangle, even though it's also an "equiangular" triangle.
An acute angled triangle, right angled triangle or obtuse angled triangle.