Question

What is cos A?


3/4

4/3

3/5

4/5

Answer 1

The cosine of an angle (in a right angles triangle), is the ratio of the adjacent side, to the hypotenuse

Answer 2

Im lost...

Answer 3

3/5?

Answer 4

Can you identify the length of the hypotenuse? the length of the longs side in the triangle?

And the adjacent side is the side of the triangle connected to the angle

Answer 5

No?

Answer 6

..., yeah 5 is the hypotenuse, and 3 is the adjacent side

Answer 7

So the answer is 3/5?

Answer 8

so you got it

cos A = adj/ hypo = 3/5

Answer 9

I have one more, can you help?

Answer 10

Yes \[\color{red}\checkmark \]

Answer 11

Same photo!

Answer 12

ok are you looking for the Sine or Tangent this time?

Answer 13

What is sin A?


3/4

4/3

3/5

4/5

Answer 14

Actually its a different photo!

Answer 15

the sine of the angle is the ratio: of the opposite side, to the hypotenuse

Answer 16

sure the file is different, but the image is the same,

the hypotenuse is still 5, but what is the opposite side?;
the side opposite to the angle A?

Answer 17

4? or 3?

Answer 18

either 3/5 or 4/5? right?

Answer 19

3 was the adjacent side,

Answer 20

4/5

Answer 21

we want the opposite side for sine

Answer 22

one of those

Answer 23

Is @robtobey correct?

Answer 24

@UnkleRhaukus

Answer 25

So it is 4/5?

Answer 26

yes

Answer 27

Thanks so much guys!:)

Answer 28

Now, what is the tangent of A?

can you remember the ratio for the tangent

tan A = ? / ??

Answer 29

adj/ hypo?

Answer 30

Wait that's wrong for tan isn't it?

Answer 31

that is cosine again

Answer 32

Thought so!

Answer 33

Hypo/ opposite side?

Answer 34

the mnemonic i use, is
SOH CAH TOA

sine = opp/hypo

cos= adj/hypo

tan =

Answer 35

Hmmmm.. Thinking

Answer 36

tan = sin/cos

Answer 37

[the tan ratio doesn't have the hypotenuse in it]

Answer 38

yes, you could work it out that way


tan = sin / cos
= (opp/hypo) / (adj/hypo)
=

Answer 39

(the hypos cancel.... and you get....)

Answer 40

Which is equal to tan x?
a sin x + cos x
b sin x - cos x
c cos x / sin x
d sin x /cos x

Answer 41

D?

Answer 42

yep

Answer 43

because
tan = opp/adj

sin/cos = (opp/hypo) / (adj/hypo)
= opp / adj

Answer 44

Sin = Opp / Hyp
Cos = Adj / Hyp
Tan = Sin / Cos = Opp / Adj

Answer 45

good!, remember this.

Answer 46

I will now! Thanks so much:)

Answer 47

Yes, is 3/5
tan = op / ady