Evaluate pi square root of 4

$π \sqrt{4}$

Rewrite $4$ as $2^{2}$ .

$π \sqrt{2^{2}}$

Pull terms out from under the radical, assuming positive real numbers.

$π \cdot 2$

Move $2$ to the left of $π$ .

$2 π$

The result can be shown in multiple forms.

Exact Form:

$2 π$

Decimal Form:

$6.28318530 \dots$