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virtus
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In triangle ABC, CD bisects the angle BCA and D lies on side AB. Angle c = 60 degrees, AC = 8cm and BC = 6cm
 2 years ago
 2 years ago
virtus Group Title
In triangle ABC, CD bisects the angle BCA and D lies on side AB. Angle c = 60 degrees, AC = 8cm and BC = 6cm
 2 years ago
 2 years ago

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virtus Group TitleBest ResponseYou've already chosen the best response.0
dw:1342162593694:dw
 2 years ago

virtus Group TitleBest ResponseYou've already chosen the best response.0
calculate the length of AB, giving your answer correct to one decimal place
 2 years ago

shandelman Group TitleBest ResponseYou've already chosen the best response.1
Are you allowed to use the law of cosines?
 2 years ago

dpaInc Group TitleBest ResponseYou've already chosen the best response.0
use the law of cosines.... \(\large (AB)^2=(AC)^2+(BC)^22(AC)(BC)cosC \)
 2 years ago

shandelman Group TitleBest ResponseYou've already chosen the best response.1
I'm not sure what DC has to do with anything...put there to confuse, I guess? I can't think of a better way to do solve it.
 2 years ago

virtus Group TitleBest ResponseYou've already chosen the best response.0
@dpaInc I tried to use cosine rule, but i don't think that is how you do it cause you get a whole no. as an answer and the question asks you to round off to 1 d.p Furthermore i checked the solution booklet and it says the answer is 7.2 cm
 2 years ago

shandelman Group TitleBest ResponseYou've already chosen the best response.1
...I didn't get a whole answer, but I also didn't get 7.2. Hmm...
 2 years ago

shandelman Group TitleBest ResponseYou've already chosen the best response.1
Oh, wait. Hold on.
 2 years ago

shandelman Group TitleBest ResponseYou've already chosen the best response.1
No, I did get 7.2, never mind. c^2 = 6^2 + 8^2  2(6)(8)cos(60)
 2 years ago

virtus Group TitleBest ResponseYou've already chosen the best response.0
oh i must have made a mistake then! THANKS
 2 years ago

virtus Group TitleBest ResponseYou've already chosen the best response.0
I get 13.8 for some reason
 2 years ago

ganeshie8 Group TitleBest ResponseYou've already chosen the best response.0
put the calculator in degrees measure.. .
 2 years ago
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