Posted by **Anon** on Sunday, February 27, 2011 at 6:53am.

I don't know how to reverse cosine decimals into angles. Can you please explain and help me solve these .

cos A= 0.28571428571

A=

cos B= 0.66666666667

B=

cos C= 0.5238089523

- cosines -
**MathMate**, Sunday, February 27, 2011 at 8:43am
If you use a calculator, it would be the cos^{-1} key.

Depending on the calculator, you would enter the cos value (e.g. 0.2857142857) and press the cos^{-1} key. Some calculators require the cos^{-1} key to be pressed first followed by the value.

If you do not use a calculator, let me know what you use, a table of cosines, or something else.

For example, cos^{-1}A is 81.7867893°.

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