Question

Determine which pair of angle is co-terminal $1230,-930$

Answer 1

$\text{Two angles are co-terminal if the difference between them is a multiple of 360° or 2π.}$

$\text{Co-terminal angles of a given angle θ may be obtained by either adding or subtracting a multiple of 360° or 2π radians.}$

Here,

–1230° – (–930°) = –300°, which is not a multiple of 360°
So, –1230° and –300° are not co-terminal