- #1

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## Main Question or Discussion Point

which formula is correct?
or

- Thread starter leojun
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- #1

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which formula is correct?
or

- #2

A.T.

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The one of the picture looks correctly derived. Where does the other one come from, and what is "a"?which formula is correct?

- #3

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We use second formula instead of the first formula to find the radius of curvature using spherometer.The one of the picture looks correctly derived. Where does the other one come from, and what is "a"?

"a" in the second formula is the same as "b" in the first formula.

The first formula is correct but i don't get why we use second formula instead of first.

The two formula's are supposed to be the same r=R,but why are they different?

- #4

A.T.

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I see no "b" in the first formula."a" in the second formula is the same as "b" in the first formula.

- #5

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SORRY,"a" in the second formula is the same as "d" in the first formulaI see no "b" in the first formula.

- #6

Bystander

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"a" is the side length of the triangle, or distance between two of the three points.what is "a"?

- #7

A.T.

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I don't think so. I think Bystander is right and the formulas are equivalent.SORRY,"a" in the second formula is the same as "d" in the first formula

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