A triangle is made up of 3 angles, which equal 180 degrees.
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A right triangle has a 90 degree angle and an acute triangle has an angle smaller than 90 degrees.
A right triangle is a triangle that contains a 90 degree angle, an obtuse triangle contains an angle that is from 91 degrees to 179 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)
A right angle is formed when two lines meet at an angle whose measure is 90 degrees. A right triangle is a triangle in which one angle is a right angle. (Note: there cannot be more than one.)
An equilateral triangle has all sides the same length and all its angles are 60dgrees. A right angled triangle is just a triangle with a right angle.