Parabolic area

Dmitry Ezhov shared this question 4 months ago

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Parabola p created by tool "Parabola" by focus F and directrix d. Points A and B lying on p and set line h. How get area betwen p and h? Command "IntegralBetween(p,h,x(A),x(B))" not work with error "Illegal argument: Parabola p".

Files: test.ggb

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Comments (13)

Simona Riva ● 4 months ago

The Integral command works with functions.

And your parabola is recognized by GeoGebra as a conic, moreover in implicit form.

You need to use functional notation like e.g. F(x)=x^2+2x+1 in order to us the related commands

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Simona Riva ● 4 months ago

See https://wiki.geogebra.org/e...

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rami ● 4 months ago

An aproximative surface is possible (in any position)

It helps to draw the area graphically and give a aproximative value to check the funcionaly formula.

Files: test(rami1).ggb

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Dmitry Ezhov ● 4 months ago

Ok. How make b (polygon ABF) with parabolic segment a in one color, and c (polygon ABCD) without a in other color?

Files: test2.ggb

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rami ● 4 months ago

it's alway the same principle.

Files: test2(ami1).ggb

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-Loco- ● 4 months ago

Bug in Segment?

/BEvvPACPD090b17dyxevBjFxcVyP6xKOH1wCSGEEHeAwSWEEEIcAINLCCGEOAAGlxBCCHEADC4hhBDiABhcQgghxAEwuIQQQogDYHAJIYQQB8DgEkIIIQ6AwSWEEEIcAINLCCGEOAAGlxBCCHEADC4hhBDiABhcQgghxAEwuIQQQogDYHAJIYQQB8DgEkIIIQ6AwSWEEEIcAINLCCGEOAAGlxBCCHEADC4hhBDiABhcQgghxAEwuIQQQogDYHAJIYQQB8DgEkIIIQ6AwSWEEEIcAINLCCGEOAAGlxBCCHEADC4hhBDiAP4fipZUKUmOAGEAAAAASUVORK5CYII=

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rami ● 4 months ago

Yes, this solution has a restriction.

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-Loco- ● 4 months ago

RightSide(p) <= LeftSide(p) && (x-x(A))*(y(F)-y(A))-(y-y(A))*(x(F)-x(A)) <= 0 && (x-x(F))*(y(B)-y(F))-(y-y(F))*(x(B)-x(F)) <= 0

and

RightSide(p) >= LeftSide(p) && (x-x(A))*(y(D)-y(A))-(y-y(A))*(x(D)-x(A)) >= 0 && (x-x(C))*(y(B)-y(C))-(y-y(C))*(x(B)-x(C)) >= 0 && y>= y(C)

Polygon(Join({{F}, Sequence(Point(p, k), k, PathParameter(A), PathParameter(B), (PathParameter(B) - PathParameter(A)) / 50)}))

and

Polygon(Join({{C, D}, Sequence(Point(p, k), k, PathParameter(A), PathParameter(B), (PathParameter(B) - PathParameter(A)) / 50)}))

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mathmagic ● 4 months ago

the AREA with great accuracy

Files: foro.ggb

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mathmagic ● 4 months ago

theory in https://en.wikipedia.org/wi...

and the graph attached

Files: foro.ggb

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Dmitry Ezhov ● 4 months ago

Thanks!

If parabola set parametric, how get separate 0.53t^2-4.55t-2.92 and 2.28t^2+1.06t-0.35?

1d76043d63e26a29e97f44107330fa27

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Dmitry Ezhov ● 4 months ago

Activity without integration.

How set restriction corner_AFB<180 degrees?

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mathmagic ● 4 months ago

see the dynamic definition of H

Files: foro.ggb

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