3 interior, and 6 exterior, i believe. so 9 is the total.
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A triangle has only 1 right angle. It only has one side that can possibly be a right angle. The type of triangle varies.
No. Angles don't have anything called a side length. However, one can use trigonometry to compute the angles of a triangle based on the side lengths of the triangle (triangles do have side lengths).
It is not an axiom, but a theorem.
There are 3 angles in a triangle.
How many sides of each triangle and how many angles of each triangle do you have ? If you have two sides and the angle between them, or two angles and the side between them, equal to the same parts of the other triangle, then your triangles are congruent. You don't even have to know what the actual numbers are. If the expressions are equal, then the sides or angles are equal.