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Please help.

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Please help.

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berkeman

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Both are correct if the radius r = 1. Can you scan the page in question and UPLOAD it?

Please help.

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Math_QED

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If they would have calculated the length of the curve ##y = \sqrt{r^2 - x^2}##, the circumference would be equal to ##2\pi r##. This is the circle through the origin with radius ##r##.

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Both are correct if the radius r = 1. Can you scan the page in question and UPLOAD it?

Oh, yes, thank you, they have said about the unit circle at first then said that it's circumference is 2pi. Sorry,I didn't notice . But thank you again, I was really confused.

If they would have calculated the length of the curve ##y = \sqrt{r^2 - x^2}##, the circumference would be equal to ##2\pi r##. This is the circle through the origin with radius ##r##.

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