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I want to draw a triangle on hyperboloid and put the name of angles and vertices but for example when i want use alpha or beta it doesn't show up? N.b i use sagemath .

I want to draw a triangle on hyperboloid and put the name of angles and vertices but for example when i want use alpha or beta it doesn't show up? N.b i use sagemath .. Like in the picture

I want to draw a triangle on hyperboloid and put the name of angles and vertices but for example when i want use alpha or beta it doesn't show up? N.b i use sagemath . Like in the picture

I want to draw a triangle on hyperboloid and put the name of angles and vertices but for example when i want use alpha or beta it doesn't show up? N.b i use sagemath . Like in the picture

I want to draw a triangle on hyperboloid and put the name of angles and vertices but for example when i want use alpha or beta it doesn't show up? N.b i use sagemath . Like in the picture

I want to draw a triangle on hyperboloid and put the name of angles and vertices but for example when i want use alpha or beta it doesn't show up? N.b i use sagemath . Like in the picture

I want to draw a triangle on hyperboloid and put the name of angles and vertices but for example when i want use alpha or beta it doesn't show up? N.b i use sagemath . Like in the picture

I want to draw a triangle on hyperboloid and put the name of angles and vertices but for example when i want use alpha or beta it doesn't show up? N.b i use sagemath . Like in the picturepicture

I want to draw a triangle on hyperboloid and put the name of angles and vertices but for example when i want use alpha or beta it doesn't show up? N.b i use sagemath . Like in the picture https://www.google.com/url?sa=i&source=images&cd=&cad=rja&uact=8&ved=2ahUKEwjFv7ztpKLiAhWMHhQKHR8VCJ4QjRx6BAgBEAU&url=https%3A%2F%2Fcommons.wikimedia.org%2Fwiki%2FFile%3ASpherical-triangle.png&psig=AOvVaw21-gcHT2JSpw0yOaFnucU0&ust=1558172924749712

I want to draw a triangle on hyperboloid and put the name of angles and vertices but for example when i want use alpha or beta it doesn't show up? N.b NB i use sagemath . Like in the picture https://www.google.com/url?sa=i&source=images&cd=&cad=rja&uact=8&ved=2ahUKEwjFv7ztpKLiAhWMHhQKHR8VCJ4QjRx6BAgBEAU&url=https%3A%2F%2Fcommons.wikimedia.org%2Fwiki%2FFile%3ASpherical-triangle.png&psig=AOvVaw21-gcHT2JSpw0yOaFnucU0&ust=1558172924749712sagemath.