Question

Can someone please help me with this?
pic in comments.

Answer 1

@RhondaSommer @imqwerty

Answer 2

20 + 35 = ? - that by 90

Answer 3

= 35.

What can equal 35 if rounded.

Answer 4

How would x be greater than the hypotenuse?

Answer 5

I just saw that. Hold on,

It showed the square box that = 90 degrees, which is a right angle, but not in the answers. I gave you the wrong format ^-^'

Answer 6

its alright ^^

Answer 7

I see what you are saying, what I don't get is what they are asking you\[I do: X=180 - given \angle + given \angle2 = x \]

but no answers could possibly add up to 180

Answer 8

its asking me for the length of x not angle...

Answer 9

I have to use sin, tan, or cosine...

Answer 10

http://www.mathsisfun.com/algebra/trig-finding-angle-right-triangle.html

Answer 11

sin

Answer 12

Sorry I was confused on what procedure.

Answer 13

Step 1: find the names of the two sides we know

triangle showing Opposite, Adjacent and Hypotenuse

Adjacent is adjacent to the angle,
Opposite is opposite the angle,
and the longest side is the Hypotenuse.

Example: in our ladder example we know the length of:

the side Opposite the angle "x", which is 2.5
the longest side, called the Hypotenuse, which is 5

Step 2: now use the first letters of those two sides (Opposite and Hypotenuse) and the phrase "SOHCAHTOA" to find which one of Sine, Cosine or Tangent to use:
SOH...

Sine: sin(θ) = Opposite / Hypotenuse
...CAH...

Cosine: cos(θ) = Adjacent / Hypotenuse
...TOA

Tangent: tan(θ) = Opposite / Adjacent

In our example that is Opposite and Hypotenuse, and that gives us “SOHcahtoa”, which tells us we need to use Sine.

Step 3: Put our values into the Sine equation:

Sin (x) = Opposite / Hypotenuse = 2.5 / 5 = 0.5

Step 4: Now solve that equation!

sin(x) = 0.5

Next (trust me for the moment) we can re-arrange that into this:

x = sin-1(0.5)

And then get our calculator, key in 0.5 and use the sin-1 button to get the answer:

x = 30°
And we have our answer!
But what is the meaning of sin-1 … ?

Well, the Sine function "sin" takes an angle and gives us the ratio "opposite/hypotenuse",

sin vs sin-1

But sin-1 (called "inverse sine") goes the other way ...
... it takes the ratio "opposite/hypotenuse" and gives us an angle.
Example:

Sine Function: sin(30°) = 0.5
Inverse Sine Function: sin-1(0.5) = 30°


calculator-sin-cos-tan On the calculator press one of the following (depending
on your brand of calculator): either '2ndF sin' or 'shift sin'.

On your calculator, try using sin and sin-1 to see what results you get!

Also try cos and cos-1. And tan and tan-1.
Go on, have a try now.

Step By Step

http://www.mathsisfun.com/algebra/trig-finding-angle-right-triangle.html



Follow it :)

Answer 14

\[\sin(35)=\frac{ x }{ 20 }=11.47\]

Answer 15

got it thanx ^^