No angles are not matter.
Matter, by itself, is not sentient. So matter is not capable of any kind of consideration. So it cannot consider anything to be, or not to be, matter.
no
gaseous matter..
It doesn't matter what type of triangle it is, or the length of the sides. The sum of the interior angles of a triangle always adds up to 180 degrees
no
A rhombus has four congruent sides. The angles don't matter, but if they're right angles, then the rhombus is a square.
The sum of the exterior angles of any polygon - no matter how many sides, no matter whether it is convex or concave - is 360 degrees.
The sum of the exterior angles of a polgon - no matter how many sides - is 360 degrees.
complementary angles measures add to 90 and supplementary angles measures add to 180. Whether they are next to each other or not does not matter.
Yes. Consider the two angles in the letter Z (or N). The diagonal line is common but the angles do not share a vertex.
transverse
No. Consider a square and rectangle.