The difference is 270 degrees.
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A right angle is an angle that measures 90 degrees. A squaer angle is a typographic error.
Two perpendicular lines make up a right angle
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.)
A right triangle has a 90 degree angle and an acute triangle has an angle smaller 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)