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# In mathematics, trigonometry, also called triangulation, is a branch of mathematics that studies relationships involving lengths and angles of triangles. The field emerged in the Hellenistic world during the 3rd century BC from applications of geometry to astronomical studies. Trigonometry is also the foundation of surveying.

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##### Alisa L.

University of Texas at Austin

AH
##### Ahyeon H.

University of California, Berkeley

##### Kristen K.

University of Michigan - Ann Arbor

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measurement of sign of 420 degrees. Now 420 is greater than 360. So we need to find what that co terminal angle iss. So this means that we need to find if I subtract 3 60 from 4. 20. So excuse me, Subtract 3 60 from 4. 20 So 4 20 minus 360 is going to equal 60 degrees. So this means that the sign of 420 degrees equals 60 plus 3 60 so that co terminal angle is 60. So we're looking for the sign of 60 degrees which will give me the sign of 420. So here is my 60 degrees and we're looking for sign, which means we're looking for are why value This is the stage right here. Sign is or why So that means that the sign of 60 or the sign of 420 is the square root of three over to

Liberty University

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##### Alisa L.

University of Texas at Austin

AH
##### Ahyeon H.

University of California, Berkeley

##### Kristen K.

University of Michigan - Ann Arbor