A right triangle is right-angled (one angle = 90º) but none are "special".
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It is any triangle - one with no special characteristic - like a right angle, or two equal sides, etc.
hypotenuse - only if it is a right triangle. Otherwise, there is no special name.
Yes.
In a right triangle (a triangle where one of the angles is exactly 90 degrees) , the longest side is called the hypotenuse. In non-right triangles, the longest side has no special name.
A scalene triangle has 3 different sides and 3 different angles that add up to 180 degrees but normally a right angle triangle is different to a scalene triangle because it has its own special properties.