We can find the measure of an angle whose cosine is 58 by pushing 2ND and then COS.
51.32
Practice makes perfect
We will use a calculator to find the measure of an angle whose cosine is 58. To do so, push 2ND and then COS.
Be sure to always check that your calculator is in the correct mode. In this case, we need degrees.
If we round our answer to the nearest hundredth, we obtain 51.32.
