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What is the meaning of Right Angle?
-- an angle that measures 90 degrees -- an angle whose sides are mutually perpendicular
What is the meaning of hypotences in geometry?
If you mean hypotenuse then it is the largest side of a right angle triangle and it is opposite a 90 degree angle.
Can you prove that angle B is the only right angle in triangle ABC?
The sum of the internal angles of a triangle is 180º. If B is a right angle it has 90º, so there are only 90º left for the other two angles, meaning that they cannot be right!
Are the exterior angles of a scalene triangle always obtuse?
No, they are not always obtuse, because a scalene triangle can also sometimes be an obtuse triangle (meaning that one interior angle is obtuse), making one exterior angle acute. Scalene triangles also can be a right triangles (meaning that one interior angle is a right angle), which would make an exterior angle a right angle. Then also they can be acute triangles, in this case all 3 exterior angles are obtuse.
Why is a right angle sometimes called a right angle?
Because a right angle is a right angle.
