what is the EXACT value of cos 180 degrees?

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what is the EXACT value of cos 180 degrees?

2006-08-30 14:43:40 · 5 answers · asked by you're_a_mango 2 in Education & Reference ➔ Homework Help

5 answers

the answer is -1
cos theta is x / r where x is the x coordinate and r is the radius of the unit circle. hence, cos 180 = -1 / 1 or -1.
hope this helps.

2006-08-30 14:48:53 · answer #1 · answered by lobster17 2 · 0⤊ 0⤋

Easy. -1. Look it up in your textbook.

Make sure you have this memorized, as well as the values of cos for other important degrees(30, 60, 90, 270, etc) and the values of sin for those same degrees.

2006-08-30 14:48:30 · answer #2 · answered by Keiron 3 · 0⤊ 0⤋

-1

2006-08-30 14:53:16 · answer #3 · answered by Anonymous · 0⤊ 0⤋

-1

2006-08-30 14:47:56 · answer #4 · answered by Anonymous · 0⤊ 0⤋

-0.5984600691

2006-08-30 14:50:00 · answer #5 · answered by rogue chedder 4 · 0⤊ 0⤋