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so you need to find D when x = y right?
r u there?
I'm here, but it is not my problem @welshfella, was hoping you would provide some more steps (for my own edification lol).
i have tried to solve it but i cant get 24m
we have the same drawing but still i cant get the answer
lol ok well i think we can use the double angle formula. write y for x:- so tan 2y = 2 tan y -------- 1 - tan^2 y and tan y 2y = 32/D and tan y = 12 / D
* that's tan 2y = 32 / D
what should i do next?
plug tan 2y = 32/D and tan y = 12/D into the above identity and solve for D
@welshfella big fat Celtic Congrats, mate!!!
HaHa Thanks Irish boy. We beat the English!!!!
@Jluz - can you solve that one for D?
i used my calcu shift solve but it doesnt result in to 24m
Yes is does, thanks @welshfella
@radar i cant get it my answer is 12.38
yea I get the same as you JLuz Maybe i made a mistake somewhere....
|dw:1443355873893:dw| Do you follow this far @JLuz
|dw:1443355996631:dw| How about to this?
yea it does work out to 24
|dw:1443356181782:dw| and then to this?
gotta go ul leave you in capable hands of radar
Can you take it to "24" ?
i wil solve
Good As you see, I just used "cross multiplication" of the fraction.
Good luck with your studies.
is results to 24
i have a question
why does she uses double angle formula??
Go ahead, but I think @welshfella has left, he had the incite for the solution.
Because the angle to the top of the antenna is equal to the sum of the two equal angles to the top of the house and the angle from the top of the house to the top of the antenna. In the drawing the big angle is equal to the sum of X and Y and we are told that they are equal .......... hence "double angle"
I was messing around trying to use the law of sines and wasn't getting anywhere, I think that double angle approach was a good idea.
i was trying to analyze your explanation haha
The use of the double angle identity was a wise choice. You will run into that identity in Trig' maybe you already have studied the trigometric identities.
ok radar thank you for your big help
it is a big help in my studies
I think you will do well, because you knew what the answer was, but you needed to know "how" or verify that it was indeed a correct answer, that is a good trait.
as well as to @welshfella