The outside, well some people say's that's the area.
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The longest side of a triangle is opposite its biggest angle.
You need the measures of two sides and for the triangle to be a right triangle to figure out the third side.
the unknown measurement of a side of a triangle
It depends on what information is available about the other sides and/or angles.
There is not such thing as a three-dimensional triangle. You are thinking of a tetrahedron which is a three-dimensional figure with each side being a triangle. This has four vertices.