Ask for better method to visualizing two-dimensional or three-dimensional areas

[juliohm]

Your question can be rephrased in more general terms: how to plot implicit functions?

There is some related discussion here:

Plotting Implicit Functions using ImplicitEquations.jl

I’m trying to plot an implicit function using Plots, ImplicitEquations f(x,y)= sqrt((x^2+144)+(y^2+144)) and I get ERROR: Cannot convert Num to series data for plotting perhaps it’s because I have x and y as symbols using ModelingToolkit, Plots, ImplicitEquations @variables x y f(x,y)= sqrt((x^2+144)+(y^2+144))