No. By definition, an acute triangle is a triangle where all three angles are <90 degrees. Therefore, an equilateral triangle, where all the angles are 60 degrees would qualify as an acute triangle.
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It is an acute triangle and if the acute angles are of different sizes then it is a scalene triangle.
An acute triangle.
In an equilateral triangle, all of the angles are equal, which makes them all 60 degrees. Therefore, all three angles are acute.
An acute angled triangle.
A scalene triangle if the acute angles are different in sizes but if the acute angles are equal then it is an isosceles triangle and in both cases all 3 angles must add up to 180 degrees