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when you say "own AB" do you mean "arc AB" ?

I believe so

I'm following

or instead of dividing theta by 2pi, multiply by 1/(2pi)

So I would solve that?

So replace both pi with 1
(I'm trying to fully understand ^^;)

2pi means 2 * pi
so the top is 1*pi the bottom is 2*10*pi and the pi's cancel

the top simplifies to 1
the bottom to 2*10 which (I assume) you know is 20

Thank you so much

yw