Question

Can anyone help me?

Answer 1

Find the value of cos θ for the angle shown.

Answer 2

Can you use a calculator?

Answer 3

yes i have a graphing calculator

Answer 4

so would I plug something into cos? like one of the coordinates shown becasue the pic does not show any values for the angles

Answer 5

Since you have the x- and y-coordinates, you can use those as the sides of a right triangle and calculate the hypotenuse.

Answer 6

First calculate the hypotenus using the Pythagoras theorem.

Answer 7

so I would use a^2+b^2=c^2?

Answer 8

yes

Answer 9

so c=7

Answer 10

Correct.

Answer 11

so do I now use \[\cos \theta= \frac{ adjacent }{ hyp }\]

Answer 12

Now using cos(theta) = adj/hyp, substitute the values you have for adj and hyp.