anonymous
  • anonymous
The point (3, -4) is on the terminal side of an angle θ . What is cos θ?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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misty1212
  • misty1212
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misty1212
  • misty1212
find the hypotenuse of that right triangle, lets call it \(h\) it will be \(\cos(\theta)=\frac{3}{h}\)
misty1212
  • misty1212
the hypotenuse you can do with your eyeballs if you remember the mother of all right triangles, the 3 - 4 - 5 right triangle or you could use pythagoras if you do not remember that one

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anonymous
  • anonymous
Through high school ive had sucky math teachers, so i barely learned anything. So, im having to take online classes and im a visual learner and dont know how to do any of this. Its so confusing
misty1212
  • misty1212
what you need to know for this is that the cosine is the first coordinate divided by the length of the hypotenuse
misty1212
  • misty1212
you are told that the first coordinate is 3 so that is your numerator also the other leg of the triangle has length 4 that means, by pythangoras, since \[3^2+4^2=h^2\] you have \[9+16=h^2\\ 25=h^2\\ 5=h\]
anonymous
  • anonymous
here are the answer choices a) - 3/5 b) 3/5 c) -3/4 D) 3/4 E) 3
misty1212
  • misty1212
ok which one is it?
anonymous
  • anonymous
b
misty1212
  • misty1212
yes

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