Four Fours/Lemmata/Three Fours/6

Puzzle

Using exactly $3$ instances of the number $4$, the task is to write an expression for $6$, using whatever arithmetical operations you consider necessary.

Solutions

Solution $1$

$6 = 4 + 4 - \sqrt 4$

Solution $2$

$6 = 4 \times \sqrt 4 - \sqrt 4$

Solution $3$

$6 = \sqrt 4 + \sqrt 4 + \sqrt 4$

Solution $4$

$6 = \dfrac 4 {\sqrt 4} + 4$

Also see

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