A right triangle has a 90 degree angle and an acute triangle has an angle smaller than 90 degrees.
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A right triangle has a right (90 degree) angle, acute triangles have all angles less than 90 degrees.
A right triangle has one angle a right angle (90o) An obtuse triangle has one angle an obtuse angle (> 90o) An acute triangle has all angles acute (< 90o)
Right = 90 degrees, acute = less than 90 degrees, obtuse = over 90, but less than 180 degrees. (between 180 and 360 is called "reflex".) A right triangle contains one right angle; an obtuse triangle contains one obtuse angle; and an acute triangle contains only acute angles.
A right triangle can be an iscosceles or scalene triangle. A right triangle is a triangle that therein has one right angle and 2 acute angles. An isosceles triangle has two sides of the same length and one different.
They both have at least two acute angles. Their centroid is not outside the triangle.