C = 2πr
r = radius
c = circumference = 18
Plug in the corresponding numbers with variables.
18 = 2πr
Isolate the r. Divide 2 and π from both sides
(18)/2π = (2πr)/2π
9/π = r
C/π = r is your formula to finding r.
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Answer:

Step-by-step explanation:
Considering the radical expression


![=2^2\left(\sqrt{3+3\sqrt{2}}\right)^2.....[A]](https://tex.z-dn.net/?f=%3D2%5E2%5Cleft%28%5Csqrt%7B3%2B3%5Csqrt%7B2%7D%7D%5Cright%29%5E2.....%5BA%5D)
Simplifying





As 
So, putting
into Equation [A]
![=2^2\left(\sqrt{3+3\sqrt{2}}\right)^2.....[A]](https://tex.z-dn.net/?f=%3D2%5E2%5Cleft%28%5Csqrt%7B3%2B3%5Csqrt%7B2%7D%7D%5Cright%29%5E2.....%5BA%5D)
As

So, Equation [A] becomes


Therefore,

Keywords: radical expression
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