how can i find the perimeter of the shaded region? any formula for the arc?

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how can i find the perimeter of the shaded region? any formula for the arc?

Mathematics
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This is very similar to the last question you asked. Where do you get stuck?
formulas.. :|

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Other answers:

i'm confused if all forulas are same or not
about the arcs
I hope now you remember the formula for the perimeter of the circle
make use of symmetry..it's helpful
yep, pi(diameter)
Yep that is right. What fraction of the circle is the arc you have here?
1/4
The other 2 sides are just str8 lines
yep.. which is equal to 20
Can you find the solution now? You have written all the necessary information down already
pi(diameter) is correct for the circle but get used to 2pi(radius), that is a more common notation
should i use the formul.. l+ 2(pi)(r)(theta/360)?
i mean l= 2(pi)(r)(theta/360)?
You do not need that. Just forget the above 2 lines.
You need the perimeter of the circle: 2pi(radius) and the fraction 1/4
oh, just that? to get the arc length?
yep
That arc length has 1/4 of the perimeter of a full circle
my answer is.. 35.71.
thank you so much:)
Yep that is it

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