Negative angle in command surface ?

alirezagholamian shared this question 3 months ago
Needs Answer

Hi

i want use negative angle in surface command, but it not define.

Surface( <Curve>, <Angle>, <Line> )

why this happened? and how i can use negative angle.

thanks

Comments (12)

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1

Please post .ggb file and say what you typed exactly

photo
1

i want work with negative angle in surface command.

photo
1

me temo que tendrás que girar a' y después usar alpha positivo por ahora

photo
1

with positive value i can draw but, my question is

why in surface command not allow to use negative angle?

in below file i hope c' is surface that, i need draw with negative angle.

photo
2

estoy de acuerdo contigo

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photo
1

Please say what you typed exactly that you think should work

photo
1

Hmm, not explicit, but ...

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


32b4e7ffd831aacc48cbea07eb623fb9

photo
1

thanks

End Value must be greater than or equal to Start Value and both must be finite.

i use this note and rotation matrix with this command

Surface( <Expression>, <Expression>, <Expression>, <Parameter Variable 1>, <Start Value>, <End Value>, <Parameter Variable 2>, <Start Value>, <End Value> )

/wdcmbaEdokCJAAAAABJRU5ErkJggg==

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1

@Michael B

This file is what I expect from the command Surface( <Curve>, <Angle>, <Line> )

photo
1

Please say what you typed exactly that you think should work


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1

when i type in command line:

surface(curve,-pi/2,zAxis)

geogebra draw surface.

thanks

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photo
1

he can now to draw surface(curve) from 0 to alpha with alpha>0

he need to draw surface(curve) from alpha to 0 with alpha<0

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