A ray.
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Any two angles of a triangle determine the third angle. As a result, the side angle angle theorem is equivalent to the angle side angle theorem.
The exterior angle of any polygon, including a tricontakaitrigon, is the angle formed between one side of the polygon and the extension of an adjacent side. The measure of the exterior angle of a regular tricontakaitrigon is 2 degrees, as each interior angle of this polygon measures 178 degrees.
All you really need is the length of any side. The easy way would be to measure the diagonals, but you can also measure each side along with the angle of each corner.
It is a characteristic of any triangle that the longest side is opposite the largest angle and the shortest side is opposite the smallest angle.
A triangle has three angles and three sides and it is possible for all three angles to be different from each other. Each angle is defined by two of the sides - which form the rays meeting at the angle's vertex. The third side is the "opposite" side. The above statement can be proven (eg by the sine rule) for any triangle.