Pi is relevant to statistics students as it (for example) appears in the well known normal distribution probability density function.
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pi is an irrational number because it cannot be expressed as a ratio of two integers. In fact, it is a transcendental number, but that is not relevant here. 3.14 is a rational approximation to pi. It is not equal to pi.
The relevant equation is 2*pi*r*(r+h) = 160.Solve this for h.
Area = pi x r x r So divide area by pi which is 3.1415 and then take the square root and that will be the radius in the relevant unit
[pi^(1/3)]^2 * pi = pi^(2/3) * pi = pi^(5/3) The answer is the cubic root of pi to the fifth power.
(pi + pi + pi) = 3 pi = roughly 9.4248 (rounded) Well, if you use the common shortened version of pi which is 3.14 and add that 3 times, you get 9.42.