Maths in a minute
Want facts and want them fast? Our Maths in a minute series explores key mathematical concepts in just a few words. From symmetry to Euclid's axioms, and from binary numbers to the prosecutor's fallacy, learn some maths without too much effort.
Euclid's fourth axiom says that all right angles are equal. But isn't that obvious?
The Indian way of adding fractions makes things easier (with musical explanation).