Whole circle: central angle is 2pi
2/3 of that would be 4pi/3 (answer)
Step-by-step explanation:
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Answer:
x1 = 0
x2 = 3
Step-by-step explanation:

If that's the right equation we can now just simplify it a bit.

Cause now it becomes obvious that we can break out x and make it into a parenthesis:

And now there's two possibilities for what x could be. Either, x is 0:

Or, the parenthesis is 0, which means that x is 3 (because 3-3=0) :

So x has two answers:
x1 = 0
x2 = 3
At least I hope this was what you were looking for
Answer:
R = 11
C ≈ 69.12
A ≈ 380.13
Step-by-step explanation:
R = d ÷ 2
C = 2πr
A = 2πr²