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



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stupidinmath
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Andras
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This is very similar to the last question you asked. Where do you get stuck?

stupidinmath
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formulas.. :

stupidinmath
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i'm confused if all forulas are same or not

stupidinmath
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about the arcs

Andras
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I hope now you remember the formula for the perimeter of the circle

Abhishek619
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make use of symmetry..it's helpful

stupidinmath
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yep, pi(diameter)

Andras
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Yep that is right.
What fraction of the circle is the arc you have here?

stupidinmath
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1/4

Andras
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The other 2 sides are just str8 lines

stupidinmath
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yep.. which is equal to 20

Andras
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Can you find the solution now? You have written all the necessary information down already

Andras
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pi(diameter) is correct for the circle but get used to 2pi(radius), that is a more common notation

stupidinmath
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should i use the formul.. l+ 2(pi)(r)(theta/360)?

stupidinmath
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i mean l= 2(pi)(r)(theta/360)?

Andras
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You do not need that. Just forget the above 2 lines.

Andras
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You need the perimeter of the circle: 2pi(radius) and the fraction 1/4

stupidinmath
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oh, just that? to get the arc length?

Andras
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yep

Andras
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That arc length has 1/4 of the perimeter of a full circle

stupidinmath
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my answer is.. 35.71.

stupidinmath
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thank you so much:)

Andras
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Yep that is it