inverse cosine of -.6466?

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inverse cosine of -.6466?

i forgot my calculator at home and this is the final step....

2007-11-19 05:46:47 · 2 answers · asked by adrianascatering 2 in Science & Mathematics ➔ Engineering

isn't my answer supposed to be in degrees...? im trying to figure out the angles of a triangle.. using the law of cosines.. a= 18.5, b= 12.2, c= 8.1, so i got cos of alpha, is -.6466. i might be wrong. help.

2007-11-19 06:03:11 · update #1

2 answers

If you have a Windows PC, then you can use the calculator found under Programs, Accessories. Turn on thew scientific mode.

inverse cosine of -.6466 is 130.28°

2007-11-19 06:32:26 · answer #1 · answered by Thomas C 6 · 0⤊ 0⤋

2.27 radians, I don't feel like giving you the other answer

2007-11-19 05:55:23 · answer #2 · answered by rogue chedder 4 · 0⤊ 0⤋