When is a triangle a rectangle?

When it fails

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Fail Jokes More Fail Jokes

What do all failing students in New Orleans have in common?

They are all below "C level".

Why did the rock star fail his depressing math exam?

He couldn't get the saddest fraction.

Triangle Jokes More Triangle Jokes

Why do math textbooks only ever give you one angle in a triangle?

Just cos.

What do you get when you mix triangles with Tumblr?

Trigger-Nometry