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It is a combination of numbers and variables, linked together by mathematical functions. For example sqrt(2y/3*7.34*pi) where y is some variable. Given the value(s) of the variable(s) it is possible to evaluate (find the value of) the expression.
It is 2*sqrt(3)/3.
Yes because circumference = diameter*pi and the value of pi is just over 3
9
30 degrees or pi/6