How do i know when to use inverse law of cosine instead of law of cosine or are they the same?

Step-by-step explanation:

There is no such thing as the inverse Law of Cosines.  You CAN use the law to find a missing angle, which is found by finding the inverse cos of a ratio.  For example, if you have all 3 sides of a non-right triangle and you are looking for the measure of an angle, you would do all the required math, and in the end you would have that cos(x) = some fraction.  Take the inverse cos on your calculator of this fraction and get the angle value.

In other words, the Law of cosines can be used to find both a missing side OR a missing angle.

#15. square

step-by-step explanation:

because quadrilatural (idk how to spell it) means somthing that is not 3d or like, equal sides (or somthing like that   you know what i meanz)

hope this halps!

bai!

5/12, or 5: 12

step-by-step explanation: