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you have two arcs of radius 10

each arc is measuring exactly 1/4th of circle (why ?)

so you can calculate the perimeter of shaded region ?

so.. if i get the arc measures.. i'll just add both then i can already have the perimeter?

my answer is.. P=900, is it correct?

Seems wrong. \[\pi \]
Is missing for sure.

What is the perimeter of a circle with radius=r?

15.71 ?

62.83

yep, perimeter's 62.83 approximately

1/4 of the circle

Correct, thus one arc has perimeter:
\[\frac{ 1 }{ 4 } 2\pi r \]

We need two arcs, so need to multiply the above equation by 2.
\[2*\frac{ 1 }{ 4 } 2\pi r =\pi r\]

\[solution: P=10\pi \]

15.71..
so.. 31.42 :)

did i get it right?

Hahah, yeah maybe. Alright. Got that.
Thank you sooo much:)

You might be right but that hurts my soul :(