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which formula is correct?
or
The one of the picture looks correctly derived. Where does the other one come from, and what is "a"?which formula is correct?
The one of the picture looks correctly derived. Where does the other one come from, and what is "a"?
I see no "b" in the first formula."a" in the second formula is the same as "b" in the first formula.
SORRY,"a" in the second formula is the same as "d" in the first formulaI see no "b" in the first formula.
"a" is the side length of the triangle, or distance between two of the three points.what is "a"?
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