Question

If the cos(A) = 2/3 and the angle A is between 180 and 360 degrees, including 180 and 360 degrees, determine the sin(A) and the tan(A). Give a detailed explanation.

Answer 1

Hi

Answer 2

cosine is adjacent and hypotenues

Answer 3

so right of the bat adjacent is 2 and hypotenuse is 3

Answer 4

using pythagorean theorem, the third side is sqrt(5)
ooo, ugly

Answer 5

yes, it is

Answer 6

now find the sine and tangent;
sine=opposite/hypotenuse=sqrt(5)/3
tangent=opposite/adjacent=sqrt(5)/2

Answer 7

give or take; I didn't really consider the degree constraints yet

Answer 8

ok

Answer 9

I am not good with geometry at all

Answer 10

What would I do next?

Answer 11

Smartone are you here?

Answer 12

well, those are the numbers, and since the constraint is 180 to 360, I would make them all negative

Answer 13

ok, thanks, if I attach a file, would you be able to see what is in it?

Answer 14

Sin is negative between 180 and 360 degrees
Tan is positive between 180 and 270 and negative between 270 and 360

Answer 15

ok, thanks

Answer 16

I am confused about this problem.

Answer 17

If cos = 2/3 then cosine is only positive between 270 and 360

Answer 18

So make sin negative and tan negative with the answers above.

Answer 19

but I do not have the answer, I do not know how to get it

Answer 20

Are you all with me?

Answer 21

darn guess noy

Answer 22

not*