Area of a segment of a circle using integral (integral value isn't matching software answer)

Moshikonet

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Joined
Mar 30, 2019
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1
Hello
I am trying to create the right integral of a segment of a circle.
I cant find on the net a method of how to do so.
I am using a drawing software(solidworks) to get the true value of the segment's area.

When i calculate the area using an integral the value is not the same.

As i see it i probrly build the integral worngly .

I attached pictures of the drawing and the integral
 

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  • IMG-20190325-WA0029.jpeg
    IMG-20190325-WA0029.jpeg
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  • IMG-20190325-WA0033.jpeg
    IMG-20190325-WA0033.jpeg
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