Is this solvable?
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Posted by: isujharris ® 10/26/2009, 11:27:09 Author Profile eMail author Edit

We are putting together an excel sheet for sizing curtains based off length and height and need help solving an equation... How do you put this in terms of r? MathCAD suggests that it's unsolvable, but I want to be sure. s = (1/2)* r * sqrt(1 + (r/a)^2) + 1/2 * a * ln(sqrt(1 + (r/a)^2) + (r/a))

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: Is this solvable?
: Is this solvable? -- isujharris	Post Reply	Top of thread	Engineering Forum

Posted by: Kelly Bramble ® 10/26/2009, 11:35:12 Author Profile eMail author Edit

Usually these programs have challenges with the placement of parenthesis as well as the input variables. The way the equation is written I wonder how excel will handle the end of the first square root.

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: : Is this solvable?
: : Is this solvable? -- Kelly Bramble	Post Reply	Top of thread	Engineering Forum

Posted by: zekeman ® 10/26/2009, 22:34:11 Author Profile eMail author Edit

If you know r and a there is no problem. It's a simple evaluation problem. If, however, you want to solve for r given s and a , then you have a difficult though solvable problem.

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