The longest side of a triangle is opposite its biggest angle.
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You need the measures of two sides and for the triangle to be a right triangle to figure out the third side.
This type of "triangle" would be the result of calculus-type calculation where one side of the triangle approaches zero in length. The figure will only be a true triangle (by definition, 3 sides, 3 angles) so long as the side is still approaching zero, no matter how small. Once the side becomes zero, the figure will fit the description in the question above, but will no longer be considered a triangle, for practical purposes.
you might be able to use tangent, sine, or cosine. you might be able to use the Pythagorean theorem, or you can used 30-60-90 triangle theorem or 45-45-90 triangle theorem
a scalene triangle, has no sides or angles the same size
A hypotenuse is the long side of a right triange.