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# Measuring Rotation

## Explore trig ratios of angles greater than 90 degrees

Levels are CK-12's student achievement levels.
Basic Students matched to this level have a partial mastery of prerequisite knowledge and skills fundamental for proficient work.
At Grade (Proficient) Students matched to this level have demonstrated competency over challenging subject matter, including subject matter knowledge, application of such knowledge to real-world situations, and analytical skills appropriate to subject matter.
Advanced Students matched to this level are ready for material that requires superior performance and mastery.
• Video

## Coterminal Angles and Reference Angles

by Rayna Schlossberg //basic
Determine positive and negative coterminal angles as well as reference angles.
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• Flashcards

## Introduction to Angles of Rotation, Coterminal Angles and Reference Angles

by Kyle Bardman //basic
These flashcards will help you better understand Algebra II with Trigonometry Concepts.
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