Yes, AAA is a way to show that triangles are similar. Note, however, that AAA is not a way to show that triangles are congruent.
A right angle is a 90 degrees angle
either a right angle or a acute angle it depends what way you turn the triangle
The right way
Left to right or right to left.
There is really not a proper way to right rollie pollies. These are known to be insects.
Yes.
Yes
because of the angle you dive in
Your question is a little unclear, but if you mean the small square drawn on the inside corner of a right angle: it is simply a way of showing a 90-degree angle.
6812 is a single number and it does not relate, in any way, to a right angle.
No way to tell as we don't know an angle or another side.