From the top of the vertical cliff 68m high, an observer notices a yacht at sea, The angle of depression to the yacht is 47 degrees. The yacht sails directly away from the cliff and after 10min the angle of depression is 15 degrees how fast is the yacht sailing?
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Help with Trig question (1 Viewer)
- Thread starter lovepink
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HeroicPandas
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D = S x T
Distance = Speed x Time
T = 10 min = 10 x 60 = 600 seconds
Distance = Change in distance from first boat to second boat
I thought general math don't learn trigonometry
Say something, so i can decide the future
Distance = Speed x Time
T = 10 min = 10 x 60 = 600 seconds
Distance = Change in distance from first boat to second boat
I thought general math don't learn trigonometry
Say something, so i can decide the future
Last edited:
HeroicPandas
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do u want me to scan my solution? (it'll be easy to see)
but u must promise me not to just skim through it and go "yes i see, i get the idea" then forget about it
HeroicPandas
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1 sec, scanner is having a go at me
Makematics
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so is trig in general? shiet i underestimated the diffculty of general.
HeroicPandas
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To remember this formula, like did, i remember PDHPE, STD = sexually transmitted disease
S x T = D
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Smile12345
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Slightly sarcastic! There's nothing wrong with a bit of Trig.... I remember doing it last year in Yr 10...
HeroicPandas
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same lol
HeroicPandas
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i've wasted my time...
Makematics
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why?
HeroicPandas
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how do i know 'lovepink' FULLY understands how i did the question?
Makematics
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you dont, but you tried your best
if he/she doesnt understand, they can ask you for further help cant they?HeroicPandas
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a confirmation is all i need! (eg. i get it, me understand, etc)you dont, but you tried your best
even if i waste 2 hours of life writing up a solution to help a person, if he/she says "yes" i'll be happy
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Smile12345
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I agree...
Makematics
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oh yeah i know what you mean. i get pissed off when people like you write up solutions and then the person doesn't even say thank you -.-
hahaha woah wasted your time? you need to chill out im not on this website 24/7 okay so dont expect a reply straight away
and yes thankyou for taking your time and putting up the working out, i do appreciate it.
but you totally lost me with 'therefor y= 68- xtan15 over ..and the one below that, like please explain
Smile12345
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I did it slightly different to this (and I still got the same answer!)....
I worked out what x was (63.41102586) and
then I worked out what x+y was (253.7794549)... Both using the Tan=Opposite/Adjacent as HeriocPandas did....
Then I got the difference between these two numbers.... (which is Y)
This was what was done in 10 minutes so multiply the number by 6 (to get 60mins/hr)... Don't forget your answer will be in metres...
Trust this helps...
I'll be back in 5 mins....
Last edited:
ah i get it!! thankyou so much xI did it slightly different to this (and I still got the same answer!)....
I worked out what x was (63.41102586) and
then I worked out what x+y was (253.7794549)... Both using the Tan=Opposite/Adjacent as HeriocPandas did....
Then I got the difference between these two numbers.... (which is Y)
This was what was done in 10 minutes so multiply the number by 6 (to get 60mins/hr)... Don't forget your answer will be in metres...
Trust this helps...