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 3 years ago
Amy is 20m S30°W from a tree. Belinda is 50m 110° T from the same tree. Find the distance between them, to the nearest metre.
 3 years ago
Amy is 20m S30°W from a tree. Belinda is 50m 110° T from the same tree. Find the distance between them, to the nearest metre.

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fiddlearound
 3 years ago
Best ResponseYou've already chosen the best response.1what do S30°W and 110° T mean ?

Mimi_x3
 3 years ago
Best ResponseYou've already chosen the best response.0Um, I'm not sure but i think South 30 degrees West , 110 degrees true bearing idk. I haven't done it in ages so I forgot xD

fiddlearound
 3 years ago
Best ResponseYou've already chosen the best response.1dw:1315630919336:dw

fiddlearound
 3 years ago
Best ResponseYou've already chosen the best response.1dw:1315631114054:dw

Mimi_x3
 3 years ago
Best ResponseYou've already chosen the best response.0Um, idk , it looks right though xDD

Mimi_x3
 3 years ago
Best ResponseYou've already chosen the best response.0How can I find the distance between them ?

fiddlearound
 3 years ago
Best ResponseYou've already chosen the best response.1dw:1315631564224:dw

Mimi_x3
 3 years ago
Best ResponseYou've already chosen the best response.0Um, I don't think that it requires sin and cos, its bearings

fiddlearound
 3 years ago
Best ResponseYou've already chosen the best response.1dw:1315631903573:dw

Mimi_x3
 3 years ago
Best ResponseYou've already chosen the best response.0What? There's not values of x and y, how can you use the distance formula ?

fiddlearound
 3 years ago
Best ResponseYou've already chosen the best response.1I got the values of x and y using the sin() and cos() in the table I drew above. Rounded to the nearest metre, I get 64 meters distance.

fiddlearound
 3 years ago
Best ResponseYou've already chosen the best response.1does it make sense ? did you learn this stuff in the past ?

Mimi_x3
 3 years ago
Best ResponseYou've already chosen the best response.0Not in the past xD, I learnt it year 7 and now I forgot xD But I remember that there's an easier way that doesn't require sin and cos

fiddlearound
 3 years ago
Best ResponseYou've already chosen the best response.1Well , if there is an easier way, I hope someone will post it here  coz I'd like to know it too :)

Mimi_x3
 3 years ago
Best ResponseYou've already chosen the best response.0Hey, you know your diagram what is the angle degrees thing for AB

fiddlearound
 3 years ago
Best ResponseYou've already chosen the best response.1what do you mean ?

fiddlearound
 3 years ago
Best ResponseYou've already chosen the best response.1yes we can calculate that  it's 240110 = 130 degrees

fiddlearound
 3 years ago
Best ResponseYou've already chosen the best response.1and you're right that we can make the problem simpler

Mimi_x3
 3 years ago
Best ResponseYou've already chosen the best response.0Yep, there's a formula to calculate it then, was it the sine or cosine formula ? or was it soh cah toa ?

fiddlearound
 3 years ago
Best ResponseYou've already chosen the best response.1dw:1315633004738:dw

fiddlearound
 3 years ago
Best ResponseYou've already chosen the best response.1I would need to calculate to find out  why are you asking ?

Mimi_x3
 3 years ago
Best ResponseYou've already chosen the best response.0If that angle can be found, then I can use the sine rule xD

fiddlearound
 3 years ago
Best ResponseYou've already chosen the best response.1are you trying to use the law of the cosines ?

Mimi_x3
 3 years ago
Best ResponseYou've already chosen the best response.0No, the Sine Rule it says it in my book xD

fiddlearound
 3 years ago
Best ResponseYou've already chosen the best response.1which sine rule ? a/sin(A)=b/sin(B)=c/sin(C) ?

fiddlearound
 3 years ago
Best ResponseYou've already chosen the best response.1yes, but we only have one angle , that 130 degrees at this point.

Mimi_x3
 3 years ago
Best ResponseYou've already chosen the best response.0I know , but the other angle is 30 right ? the one that I drew

fiddlearound
 3 years ago
Best ResponseYou've already chosen the best response.1why did you pick 30 degrees ?

fiddlearound
 3 years ago
Best ResponseYou've already chosen the best response.1is it becasue sin(30)=1/2 ?

Mimi_x3
 3 years ago
Best ResponseYou've already chosen the best response.0Well, the question S30°W so that angle is 30 right ?

fiddlearound
 3 years ago
Best ResponseYou've already chosen the best response.1dw:1315634688115:dw

upsilon
 3 years ago
Best ResponseYou've already chosen the best response.2No, you can't say that...@mimidw:1315634688202:dw

fiddlearound
 3 years ago
Best ResponseYou've already chosen the best response.1The 30 degrees would be relative to the black line I drew.

fiddlearound
 3 years ago
Best ResponseYou've already chosen the best response.1yeah, upsilon says the same thing.

Mimi_x3
 3 years ago
Best ResponseYou've already chosen the best response.0Can it be 60 then, since 9030 = 60 ?

upsilon
 3 years ago
Best ResponseYou've already chosen the best response.2You can't decide like that you need the angle to be in ratio with the opposite sides...

fiddlearound
 3 years ago
Best ResponseYou've already chosen the best response.1but the law of the cosines might work here.

fiddlearound
 3 years ago
Best ResponseYou've already chosen the best response.1dw:1315635067683:dw

upsilon
 3 years ago
Best ResponseYou've already chosen the best response.2\[d = \sqrt{ a^2 + b^2  2*a*b*cos\alpha}\]

fiddlearound
 3 years ago
Best ResponseYou've already chosen the best response.1http://www.wolframalpha.com/input/?i=sqrt%2820^2%2B50^22*20*50*cos%28130%29%29 It's 64 , same answer I got with the first method :)

fiddlearound
 3 years ago
Best ResponseYou've already chosen the best response.1and it's much shorter than the first method :)

Mimi_x3
 3 years ago
Best ResponseYou've already chosen the best response.0yup xD. Your method looked so complicated before (:
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