Question

Help?

Answer 1

Any ideas?

Answer 2

no ):

Answer 3

That's ok

Answer 4

We're given an angle and a known adjacent side. We want to find the opposite side.

Answer 5

What trig function uses the opposite and adjacent side?

Answer 6

tan

Answer 7

good, so tan(angle) = opposite/adjacent

Answer 8

Since the angle is 55 degrees and the adjacent side is 20, we can say


tan(55) = x/20


where x is the unknown height (which is the opposite side)

Answer 9

Our goal now is to solve for x

Answer 10

would the answer be B

Answer 11

no, how would you isolate x?

Answer 12

in the equation tan(55) = x/20

Answer 13

yes i know that but then what sorry but i dont know this stuff

Answer 14

You're dividing x by 20. So you undo this, you're going to multiply both sides by 20. What do you get when you do this?

Answer 15

1100

Answer 16

Ah i see what you did, well you don't mix the stuff on the outside of tangent with the stuff on the inside of tangent.


All you need to do is go from


tan(55) = x/20


to


20*tan(55) = x


Then flip the equation to get


x = 20*tan(55)

Answer 17

So the answer is actually choice A

Answer 18

and I got this answer by multiplying both sides by 20 to isolate x (but I can't multiply the 20 and 55)