Why is the obtuse triangle always upset?
Because it's never right!
Because it's never right!
An obtuse triangle literally cannot have a right angle by definition, so "never right" is a geometric fact — but it also means perpetually wrong or incorrect. Pairing this with the right-angle joke creates a nice contrast: one shape is always right, the other never is.
Deliver with a sympathetic shake of the head, like you genuinely feel for the obtuse triangle's plight.
Perfect for:
Math jokes rely on the same logical structure as mathematical proofs — setup (hypothesis), expectation (theorem), punchline (QED of comedy).
There are three kinds of people in this world...
Next joke →What did the calculator say to the student?
Parallel lines have so much in common...
It's a shame they'll never meet.
Why should you never argue with a 90-degree angle?
Because it's always right!
What did the triangle say to the circle?
You're pointless!
Why was the geometry teacher late to work?
She took the rhombus!
How does a mathematician plow fields?
With a pro-tractor!
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