An acute triangle is a triangle with all angles smaller than a 90 degree right angle.
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If all three angles of a triangle measure less that 90 degrees (if all three angles are acute), the triangle is an acute triangle. A triangle that has a right angle (an angle the measures exactly 90 degrees) is a right triangle. (The other 2 angles will be acute angles.) A triangle that has an angle that is greater than 90 degrees (an obtuse angle), is an obtuse triangle. (The other 2 angles will be acute angles.)
It is a scalene triangle which has 3 different interior acute angles
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.
Oh honey, that's a sassy little shape called a scalene triangle. It's got three sides of different lengths, two acute angles (less than 90 degrees), and one right angle (90 degrees). It's like the rebellious teenager of the triangle family.
Neither. An acute triangle has all angles less than 90 degrees. An obtuse triangle has one angle more than 90 degrees. A right triangle is simply just a right triangle, since it has one angle of 90 degrees.