# How do you find abs( 2i )?

$| 2 i | = 2$
$| a + b i |$ for a complex number $a + b i$ is given by
$\sqrt{{a}^{2} + {b}^{2}}$.
Hence, $| 2 i | = | 0 + 2 i | = \sqrt{{0}^{2} + {2}^{2}} = \sqrt{0 + 4} = 2$