Evaluate 2pi*2pi

$2 π \cdot 2 π$

Multiply $2$ by $2$ .

$4 π π$

Raise $π$ to the power of $1$ .

$4 (π^{1} π)$

Raise $π$ to the power of $1$ .

$4 (π^{1} π^{1})$

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$4 π^{1 + 1}$

Add $1$ and $1$ .

$4 π^{2}$

The result can be shown in multiple forms.

Exact Form:

$4 π^{2}$

Decimal Form:

$39.47841760 \dots$