It is an angle that is 90 degrees.
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In Euclidean geometry, a triangle must be one of these: acute, obtuse, or right. Maybe there is a non-Euclideangeometry for which some obtuse triangles can contain a right angle, but it doesn't happen in Euclidean geometry.
acute angle IS SMALLER tHAN a Right Angle so it is Graeater than 0degree but Smaller than 90degree
In geometry, a hypotenuse is the longest side of a right-angled triangle, the side opposite the right angle.
If you mean hypotenuse then it is the largest side of a right angle triangle and it is opposite a 90 degree angle.
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