RUDE NUMBERS

A right angle is exactly 90 degrees — always correct, never obtuse.

✓ TRUE FACT

A right angle is 90°, meaning it’s one-quarter of a full 360° rotation. In radians, that’s π/2, which is why right angles show up constantly in trig identities.

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The number 2 is social, which is why it keeps pairing up with everyone.The square root symbol was invented as a tiny roof for nervous numbers.A perfect number is a number that is equal to the sum of its proper divisors, such as 28 — perfection defined through math, not personality.The Riemann Hypothesis is one of the biggest unsolved problems in mathematics — math’s longest suspense thriller.Math is a universal language used across all scientific disciplines — the only one everyone studies and still argues about.The number 13 is “unlucky” because it has a reputation and refuses to fix it.See all Rude Numbers facts →

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