If the side opposite the 60 degree angle in a 30-60-90 degree is 12 centimetres, then what length of the side opposite the 30 degree angle?

Postulate

Step-by-step explanation:

A postulate in the context may may simply be called a mathematical claim or logic. Postulates such as described above about the intersection of distinct planes which results into a line has no mathematical proof to back or hold true of the statement. However, the fact that it isn't proven doesn't make it untrue. And this is the difference between postulates and theorems. Postulates cannot be proved or disproved best regarded as axioms. While theorems have mathematical proofs that backs its derivation.