A triangle with an acute angle.
An acute triangle has all three angles less than 90 degrees.
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An Acute Triangle
It is possible for an isosceles triangle to be an acute triangle because, in an acute triangle all the angles have to be less than 90o.
A triangle with 3 acute angles is simply called an acute triangle.An example is an equilateral triangle, which has three angles of 60° (acute).
An equilateral triangle has 3 equal interior acute angles of 60 degrees
Such a triangle would presumably have one right angle, and two acute angles. A right angle has a measure of 90 degrees; an acute angle has a measure of less than 90 degrees. Since both of the other two angles in a right triangle must be acute angles, you'd think at first that every right triangle must be a right acute triangle. But when you go and look up the definition of an "acute triangle", it turns out to be a triangle in which all three angles are acute. So the fact is that there's no such thing as a right acute triangle, because the 90-degree angle in a right triangle is not acute.