Reflexive Postulate, or Identity Postulate.
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The reflexive property simply says that A=A, in other words, any number is equal to itself.
The three angles of a triangle are always equal to 180°, if not equal to 180° then it is not a triangle.
Yes, if you add zero to any number, it will always remain itself. The value of zero is, literally, nothing, so nothing would be added to any number.
An identity is a statement which says two quantities are equal, like as x + y = y + x or sin (x + y ) = sin x cos y + cos x sin y .
Well It came mean several things. Say its 9 over 27, and it says it is equal to 1 over x, you could easily find out it is 9 over 27 = 1 over 3.