Question

TRIG HW; find missing side by using trignometry

Answer 1

Explanation:

Use SOH CAH TOA to recall how the trig functions fit on a triangle

SOH: Sin(Ф)= Opp / Hyp

CAH: Cos(Ф)= Adj / Hyp

TOA: Tan(Ф) = Opp / Adj

the above is really helpful if you don't have a brain. :P

for 7 we only need Pythagoras's theorem, know it?

`c^(2)` =
`a^(2)` +
`b^(2)`

out of curiosity.. does the above formula seem "impossible" ? or does it make sense?

`c^(2)` =
`12^(2)` +
`16^(2)`

`c^(2)` = 144 + 256

`c^(2)` = 400

c =
`√(400)`

c = 20

x= 20

for 8 we do need the above list of trig functions. we want to find the Hyp x and we know an angle and the adjacent side sooo use Cos .. b/c we can see it's got those parts in it

Cos(60) = 18 / x

I'll show you the algebra we need to use to get this formula so that we can find x

A = B / x ( this is how it looks above )

x = B / A , now just put in the parts

x = 18 / Cos(60) now solve it w/ your calculator.. :P Cos(60) happens to be 1/2 so you could have done this w/o your calculator :/

x = 36

there you go, :)