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Hi, I am new to geogebra and I need it to model a building.
I want to model the Gherking and I need 3 polaboroids that are only visible at certain fragments.
for example
I have the formula
f(x,y)=0.355 x^(2)+0.355 y^(2)-213.16
and I need the surface to be visible only for 0<=z<=70.15
what commands do I use?
cheers
The same problem 
f(x,y)=0.355 x^(2)+0.355 y^(2)-213.16
if(0<=f(x,y)<=70.15,f(x,y))
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