Definition of unit circle
: a circle having a radius of 1
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Recent Examples of unit circle from the Web
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Since going a distance π takes you halfway around the unit circle, cos(π)=-1 and sin(π)=0, so eiπ=-1.
These example sentences are selected automatically from various online news sources to reflect current usage of the word 'unit circle.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.
First Known Use of unit circle
1852
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