`theta = -215^@` Find the reference angle `theta ' ` and sketch `theta` and `theta ' ` in standard position.
`theta = -215 ^@`
`theta '` = the reference angle
The reference angle is defined as
"The smallest angle that the terminal side of a given angle makes with the x-axis"
so the reference angle is `theta '` = `35^@` which is shown in the attachment below