@TSS-Graviser Yes, it's because the construction of a tangent not perpendicular to the radius is inherently possible, which is why the diagram just looks wrong. But when you prove things, you can't just say, "It looks like it..." You instead refer to theorems, facts or properties that are unambiguous. For now it's just very weird, but being able to prove things, while onerous at times, makes it nice for us, because we can put total faith in our assumptions and calculations.