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Mimi_x3
 3 years ago
Cindy is some distance NW from a building Don is some distance due North of a building. If Don is twice as far as Cindy from the building and they are 40m apart, calculate their distances to the building to the nearest onetenth of metre.
Can someone please explain step by step on how to do this, I'm like so lost
Mimi_x3
 3 years ago
Cindy is some distance NW from a building Don is some distance due North of a building. If Don is twice as far as Cindy from the building and they are 40m apart, calculate their distances to the building to the nearest onetenth of metre. Can someone please explain step by step on how to do this, I'm like so lost

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xactxx
 3 years ago
Best ResponseYou've already chosen the best response.2Okay. dw:1316163703925:dw

Mimi_x3
 3 years ago
Best ResponseYou've already chosen the best response.1Do i calculate x by soh cah toa thing ?

xactxx
 3 years ago
Best ResponseYou've already chosen the best response.2no, the triangle is not guaranteed to be right angled.

xactxx
 3 years ago
Best ResponseYou've already chosen the best response.2do you know of the sine rule?

Mimi_x3
 3 years ago
Best ResponseYou've already chosen the best response.1Yup, do i use the sine rule ?

MeEngr
 3 years ago
Best ResponseYou've already chosen the best response.0use law of cosines or law of sines here to find the angles from the lengths

xactxx
 3 years ago
Best ResponseYou've already chosen the best response.2you can use cosine rule a^2 = b^2+c^22bc cos A for angle B

Mimi_x3
 3 years ago
Best ResponseYou've already chosen the best response.1Okay, like 40/sin45 = x/sinC ?

xactxx
 3 years ago
Best ResponseYou've already chosen the best response.240^2 = x^2 + (2x)^2  2x(2x) cos 45 1600 = x^2 + 4x^2  4x^2 (1/sqrt(2)) 1600 = 5x^2  2sqrt(2)x^2 1600 / (5  2sqrt(2)) = x^2 x^2 = 736.79 x = sqrt(736.79) = 27.14m So Don is 27.1*2 = 54.2m away from the building and Cindy is 27.1m away from the building.

xactxx
 3 years ago
Best ResponseYou've already chosen the best response.2btw in the diagram I swapped Cindy and Don, but that's not too much of a problem... the problem works itself out in the same way.

Mimi_x3
 3 years ago
Best ResponseYou've already chosen the best response.1Um , I did it and I got x= 47.568 xD

xactxx
 3 years ago
Best ResponseYou've already chosen the best response.2I still you should still get to the same answer...?

Mimi_x3
 3 years ago
Best ResponseYou've already chosen the best response.1idk, thats how i did it 1600 = x^2 + 4x^2  4x^2 * cos45 1600 = x^2 *cos45 cos45x^2 = 1600 x^2 = 2262.74 x = 47.578 Did I stuff it up somewhere ?

xactxx
 3 years ago
Best ResponseYou've already chosen the best response.2yes. You first perform multiplication, then subtraction, according to BODMAS. You first applied subtraction and then multiplication!

Mimi_x3
 3 years ago
Best ResponseYou've already chosen the best response.1Hm, i don't follow the BODMAS thing xD Wonder why I stuffed it up xD but how did I stuff it up ? Since I already subtracted it first

xactxx
 3 years ago
Best ResponseYou've already chosen the best response.21600 = x^2 + 4x^2  4x^2 * cos 45 You first performed addition and subtraction: 1600 = x^2 * cos 45 when you should have first performed multiplication! 1600 = x^2 + 4x^2  2.828x^2

Mimi_x3
 3 years ago
Best ResponseYou've already chosen the best response.1Where did you get 2.828 from ?

Mimi_x3
 3 years ago
Best ResponseYou've already chosen the best response.1Oh yeah my bad i forgot about that Thank you (:
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