Pi (not "pie") is an important number in math, equal to about 3.14159625. It is the ratio between the circumference and the diameter of a circle; but this number also appears in many other places, even some where the relationship with a circle is not so obvious.
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Math...which was done by the Aztecs.
Done.
what course can be done without maths
Exponents did not change math, per se, math has always been the same. But the use of them has changed the way math is done. It has allowed mathematic formulas to be shortened and simplified.
No, any operation can be done to them.