Measuring sum of angles of triangles on different curvature

I was reading Richard Feynman’s Six Not so Easy pieces where I came across the concept of measuring geometric shapes drawn on different curved surfaces like the ones with negative and positive curvatures. So out of curiosity I drew a few triangles on a ball and using a protractor measured the sum to be approximately 210 degrees in all cases.

I wonder what would be the sum of angles of the triangle drawn on the interior of a hollow sphere. So, I took a bowl ( not an exact sphere) and drew a triangle on the inside but now I can’t measure it since the protractor won’t fit. Is there any other way to measure it? If not what would be the approximate summation? I also wonder how it would turn out on hyperboloids and more…