How do you find an angle with a positive measure and an angle with a negative measure that are coterminal with 620∘?

1 Answer
Sam F. · Stefan V.
Feb 5, 2018

Add and subtract one full rotation (360∘) until you get a positive angle or negative angle, respectively.

Explanation:

If you have a 620∘ angle, you could either add 360∘

620∘+360∘=980∘

or subtract 360∘

620∘−360∘=260∘

Since both of these angles are positive co-terminal angles, either one is a correct answer to your question. In order to find a negative coterminal angle, simply keep subtracting until you get a negative number.

620∘−360∘=260∘

then

260∘−360∘=−100∘→ a negative coterminal angle

Hope this helps!

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