first you need to remember that cos is adjacent over hypotenuse.
the H here is side VU the A is 6( youre being asked about angle V) The O is going to be 15.
cosV=6/H
I think in this instance you need to figure out the length of H to find angle V. pygorthean thery: a^2+b^2=c^2 c is always hypotenuse. a and b can be either opposide or adjeacnt, however you want.
15^2+6^2=c^2 225+36=c^2 261=c^2 square root of 261=c(hypotenuse)
so now we go back to the cos equation cosV=6/square root of 261 the angle pf cosV is 68.28 degrees
