have to find the missing value to the nearest hundreth for Cos__=9/20

Question

Help please

Answer 1

Use the inverse cosine feature of your calculator. It might look like cos with a little raised -1 next to it.

invcos (9/20) = ???

Your answer will be in degrees or radians depending on your calculator setting.

Try invcos (1/2). If it gives you 60 then your calculator is giving you degree answers.

I am guessing that invcos (9/20) will be a little smaller than invcos (10/20), so it will be a little smaller than 60 degrees.

Think of a right triangle with one leg 9 units and longest side 20 units. The unknown you are looking for is the size of the angle formed by the 9 and 20 unit sides.

Answer 2

The answer is 63.26…..
No need for the long paragraph xx
-J

Answer 3

JujuHammy giving the answer a whole eleven years after the original post, what a legend.