Question

Can you please teach me how to solve this?
Look at pic below

Answer 1

Use Cos ratio.

Answer 2

yep. cos ratio...

Answer 3

cos(35) = x/15.2
x = cos(35) * 15.2

Answer 4

cos (angle) = adjacent side / hypotenuse

Answer 5

remember the mnemonic (spelling?): SOH-CAH-TOA

Answer 6

a= adjacent side
b= opposite side
c= hypotenuse
with respect to the angle theta

Answer 7

the answer is 12.5 am i correct?

Answer 8

The angle does not matter. Sin(x) = opp / hyp; cos(x) adj / hyp; tan(x) = opp / adj

Answer 9

Hmmm, in your question, it's 35 degrees..
and you're right

Answer 10

i'm jumping the gun again... :) pay no attention to the owl with the black hat...

Answer 11

if cos(35)= x/15.2. How on earth does it go to 12.5cm?

Answer 12

You are correct. x = 12.5 cm, not the angle

Answer 13

cos(35)= x/15.2
Both sides multiply by 15.2
15.2 cos 35 = x

Answer 14

Can i solve this using my calculator?

Answer 15

What would I have to input?

Answer 16

First put cos35
The multiply the answer by 15.2

Answer 17

Ahh. got it. Thanks so much @callisto, once again I learn from you:)

Answer 18

welcome :)

Answer 19

One more question. How do I know which one (sin, cos, tan) to use for each triangle?

Answer 20

How did you know to use Cos for that one?

Answer 21

It depends on the situation
you have the angle and hypotenuse. and you want to find the adjacent side. So you'll use cosine

Answer 22

Ohh. In which case would I use the other 2?

Answer 23

For sin, if you're given hypotenuse and angle, and you want to find opposite side, use sine
for tan, if you're given opposite side / adjacent side, and want to find another one, use tan

Answer 24

Ok. Got it, thank you so much!!

Answer 25

welcome:)