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.
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A right triangle has a 90 degree angle and an acute triangle has an angle smaller than 90 degrees.
In an acute triangle, all angles are smaller then 90%, In a obtuse triangle, there is normally one angle greater then 90%. A easy way to remember acute triangle, is it has the word "cute" in it.
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)
They both have 3 sides but an isosceles triangle has two equal sides whereas an acute triangle with different acute angles has no equal sides and is said to be a scalene triangle, or an acute triangle with three equal acute angles (of 60° each) and three equal sides is called an equilateral triangle.