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bergen parabola

Stack #13959

QuestionAnswer
equation for parabola [^v] y=a(x-h)^2+k
equation for parabola [<>] x=a(y-k)^2=h
a.o.s.[^v] x=h
aos [<>] y=k
focus[^v] (h,k+1/4a)
focus[<>] (h+1/4a,k)
directrix[^v] y=k-1/4a
directrix[<>] x=h-1/4a
dir, of opening[^v] ^ if a>0, v if a<0
dir. of opening [<>] > if a>0, <if a<0
length latus rectum[^v] I1/aI units
length latus rectum [<>] I1/a! units
Created by: karbear
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