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Useful Numbers

The most useful irrational numbers.

π = 3.14159...
pi
pi
√2 = 1.414...
square root of 2
root2
√3 = 1.732...
square root of 3
root3
ɸ = 1.618...
phi
golden ratio
phi
e = 2.718...
Euler's number
Napier's constant
e

Memorize a few digits of each of these mathematical constants.
You will use π, √2, and √3 in simple geometry, ɸ and e in higher mathematics.