Question

Anyone mind helping me out in some stuff in trigo? Got Exam later.

Answer 1

yes, what exactly do you need help with ?

Answer 2

Like example My opposite angle is 8 and my adjacent angle is -15. I need to find the hypotenuse of it.

Answer 3

you mean that the opposite side is 8, the adjacent side is 15 and you want to find the hypotenuse that's unknown?

Answer 4

I dont know how to use the pythagorean theorem

Answer 5

For this there is a formula

` a² + b² = c² `
(when the triangle, is a right triangle: saying that it has a 90º angle this formula always applies)

`a` and `b` are the two smaller side of the triangle, and `c` is the hypotenuse ─ the biggest side.

So in your case you just plug in 8 and 15 for a and b.
` a² + b² = c² `
` 8² + 15² = c² `
` 64 + 225 = c² `
so you are getting that ` c² = 287 ` and thus you know that ` c =17 `

\(\large\color{blue}{ \rm makes~~~sense ~~~? }\)

Answer 6

289, not 287 but you get the idea, right ?

Answer 7

I just didn't have a calculator.

Answer 8

what about the decimal pi into fraction pi? how do you make it into fraction pi?

Answer 9

I don't really get what you are asking, sorry -:(

Answer 10

Wait let me show you.

Answer 11

When i convert degree to radians its in decimal form.

Answer 12

alright, but I have to go in 5 minutes. I am very sorry. (sport center)
I didn't want to leave you without any help, so I'll take my last try to do at least something.

@ jim_thompson5910 @ganeshie8 do you mind helping him instead of me, I gtg, please.

Answer 13

@jim_thompson5910

Answer 14

ok thanks

Answer 15

What's your question?

Answer 16

When i convert deg to rad its in decimal form.

Answer 17

which angle are you converting?

Answer 18

like when i do this equation 90 degrees divide 2 pi

Answer 19

so you're converting 90 degrees to radians?

Answer 20

well the answer on my calculator is 14.3223

Answer 21

yup

Answer 22

so multiply 90 by pi/180

Answer 23

oh i see.

Answer 24

what do you get

Answer 25

Pi/2

Answer 26

am i correct?

Answer 27

Its because we got exam on conversion of units in Degree, radians, mils and grad

Answer 28

pi/2 is correct

Answer 29

we also got exam on trigo functions, reference angle, quadrantal angles, coterminal angles, and the angle of elevation and depression.

Answer 30

Well im a freshmen in college thats why im a little stressed in trigo and advanced algebra.

Answer 31

I'm sure you'll do fine. Just review all your notes and ask the teacher (or classmates) any questions that come to mind. Also try to memorize as much as possible and try to make things stick permanently.

Answer 32

Just two more topics and im good to go. Reference and quadrantal angles

Answer 33

Then im good to go later at our preliminary exam later

Answer 34

Did you have a specific question?

Answer 35

given theta = 18 degree

Answer 36

then the second one is given theta is 75 degree

Answer 37

so multiply that by pi/180 to get

18*(pi/180) = 18pi/180 = pi/10

Answer 38

That means 18 degrees = pi/10 radians

Answer 39

you mean in reference angle?

Answer 40

oh I thought you were converting to radians?

Answer 41

no i already got that conversions

Answer 42

Im talking about a different topic.

Answer 43

reference angle

Answer 44

18 degrees is in Q1, so it is its own reference angle

Answer 45

what about 75 degree?

Answer 46

same thing

Answer 47

anything from 0 to 90 is its own reference angle

Answer 48

how about when its from 180 to 360 degrees?

Answer 49

example 120 deg.

Answer 50

A picture helps