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 Aug5 awarded Necromancer Jul29 reviewed Approve Represent a prime number $p$ congruent to $1$ $\pmod{3}$ by a sum of a square and $3$ times a square Jul17 awarded Enlightened Jul17 awarded Nice Answer Jun8 reviewed Approve Why does $1-\sqrt{1-4pq} = 1-|p-q |$ for $p \in (0,1)$ and $q=1-p$? Jun2 answered Why a subspace of a vector space is useful May21 awarded Yearling Mar10 awarded Nice Answer Feb2 reviewed Approve Packing circles on a line Jan18 comment Equilateral triangle geometric problem thanks, corrected Jan18 revised Equilateral triangle geometric problem arithmetic error in the last 2 lines (25/4 instead of 25/2 as per comment Jan9 reviewed Approve Derivative of trigonometric function help Sep30 accepted $\frac{dy}{dx}=1+\frac{2}{x+y}$ solution by an “integrating term” May21 awarded Yearling Mar14 answered Show that the surface area of a cone with base radius $a$ and height $h$ is $\pi a \sqrt{a^2+h^2}$ Mar13 comment Equilateral triangle geometric problem see the edited answer Mar13 revised Equilateral triangle geometric problem added 644 characters in body Mar13 comment Equilateral triangle geometric problem Hold on, there is a flaw in my picture, correcting now Mar13 comment Solve $x=y\frac{dy}{dx}-\left(\frac{dy}{dx}\right)^{2}$ Check out this: en.wikipedia.org/wiki/Clairaut's_equation Mar13 answered Equilateral triangle geometric problem