In teaching the high school curriculum Pythagoras is usually bundled with Trigonometry. They might be justified by way of proof of some sort. They are used to solve 2d and 3d geometry problems for unknowns.
They are bundled together with the justification that they both are used for funding unknowns in right triangles. I would argue against this pairing on the basis that their similarities are superficial and their differences are more fundamental.
In fact, either could be taught first with their own respective prerequisites.
What arguments are some arguments for their sequencing?