`theta = -215^@` Find the reference angle `theta ' ` and sketch `theta` and `theta ' ` in standard position.

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Chapter 4, 4.4 - Problem 48 - Precalculus (3rd Edition, Ron Larson).
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kspcr111 | In Training Educator

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`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 

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