a right angle is exactly a 90 degree angle. for example, there are 4 right angles on a square, the corners are right angles. like the edges on papers that is a right angle. an oblique line is smaller than a right angle.
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The symbol is (theta i) which looks like a 0 with a line through it and a little i beside it on the bottom right corner
I believe that it's not called anything, it is just a symbol to indicate that the angle is a right angle (90 degrees)
reflex angle
there is no symbol, you just say angle A is adjacent to angle B
Because a right angle is a right angle.