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 Mar8 awarded Yearling Mar8 awarded Yearling Apr20 comment Distance between the two points $P$ and $Q$ Yes, they are. Here is the general formula: $d=\sqrt{(x_2-x_1)^2+(y_2-y_1)^2}$ Apr3 comment Volume by cross-section of a donut Guys, I am sorry for not correct answer at first.. I am at work and distracted a lot. Everything is correct now. Apr3 revised Volume by cross-section of a donut added 148 characters in body Apr3 revised Volume by cross-section of a donut added 233 characters in body Apr3 revised Volume by cross-section of a donut added 233 characters in body Apr3 comment Volume by cross-section of a donut You must have an error in your calculations, you can post them and we'll check or I can write my owns. Apr3 answered Volume by cross-section of a donut Apr2 comment How to find the least positive root? WolframAlpha might be a handy tool too. You can get pretty accurate approximations of roots by just typing your equation. Apr1 comment How to find $\frac{d^2x}{dy^2}$ I had to tilt my head to read your answer :D Apr1 answered Integration with pdfs and cdfs Apr1 answered Geometric Interpretation for Definite Integrals with $\pi$ in the result Mar29 comment Introductory Level Books for Graph Theory math.stackexchange.com/questions/27480/… Mar29 comment Probability Dice Problem Your solution is not quite right. I don't even understand what it tries to calculate. Mar29 awarded Custodian Mar29 reviewed Reviewed Real analysis textbok that develops the subject in a self-motivated, coherent fashion? Mar28 revised Find the maximum dimensions that will strengthen rod added 3 characters in body Mar28 revised Find the maximum dimensions that will strengthen rod added 39 characters in body Mar28 answered Find the maximum dimensions that will strengthen rod