It is a prerequisite for higher math, which will be used for the rest of your life.
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No. Postulates are the foundations of geometry. If you said they were wrong then it would be saying that Euclidean geometry is wrong. It is like if you asked how do we know that English is right. It is how the English language works. So no postulates do not need to be proven.
A Geologist needs to know a lot about geometry.
I might need to use geometry when I am adding, subtracting, dividing, multiplying, and shapes
you are too stupid to know
it means arrow ending