Question

Any kind of help needed!

Find each missing length to the nearest tenth of a unit.

8.
a.) 19 in.
b.) 38 in.
c.) 26.9 in.
d.) 32.9

9.
a.) 3 m
b.) 12 m
c.) 5.2 m
d.) 6 m

**Im going to try to post the images up, if not I can describe them.

Answer 1

This is for question 8

Answer 2

This is for question 9

Answer 3

Anyone with any kind of help towards these questions is needed! You don't have to give me any answers, but helping me solve them would be nice.

Thanks(:

(I need answers AS SOON AS POSSIBLE!)

Answer 4

Have you learned SOH CAH TOA ?

Answer 5

No I haven't...

Answer 6

Q8:
SOH CAH TOA, means use Sine and the sides opposite/hypotenuse. CAH means use cosine and the sides adjacent/hypotenuse. TOA means use tangent and sides opposite/adjacent.
You can also use \(C^2 = A^2+B^2\) Have you learned this one?
Because you have angle 45, then you know the other angle is 45. So the legs are equal. so A=19, B=19 and you can solve for C=x

Ok, for CAH we have a side adjacent to the angle and the hypotenuse.
cos(45) = 19/x
\(\large x=\frac{19}{cos(45)}\)
can you solve that?

Answer 7

Is that right Phi?

Answer 8

Something tells me peeta is not learning trigonometry, but is studying "special triangles" i.e. 30-60-90 and 45-45-90 triangles.

Answer 9

Or better method for not yet learned SOH CAH TOA?

Answer 10

That is what I was thinking now that I look again

Answer 11

Yeah, I am only trying to figure out the answers to them haha. I haven't learned all of those methods or anything

Answer 12

This is just memory: if you see a 30-60-90 triangle, the side opposite the 30 degree angle is the shortest side and it equals 1/2 the length of the longest side (hypotenuse, opposite the 90 deg angle)

Answer 13

So, special triangles:

45 and 90, means that the other is 45, since the angles sum to 180. So 180-90-45 =45

This means both legs are the same, 19in.

\(C^2=A^2+B^2 = 19^2+19^2\)

Or, just multiply the 19 by sqrt(2) and that is it. since you have 19, and the acute angles in my picture are 45

Answer 14

I'm not sure I am following... Im sorry. This topic confuses me a lot.

Answer 15

In a 45-45-90 triangle, both legs are equal, and both are equal to sqrt(2)/2 times the longest side (hypotenuse)

Answer 16

Oh okay I understand now! Thank you!

Answer 17

thanks @phi

Answer 18

Thanks to both of you. You helped me a lot

Answer 19

this is the special triangle for 30-60-90 triangles.
http://en.wikipedia.org/wiki/Special_right_triangles