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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
 one year ago
 one year ago
In triangle ABC, CD bisects the angle BCA and D lies on side AB. Angle c = 60 degrees, AC = 8cm and BC = 6cm
 one year ago
 one year ago

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virtusBest ResponseYou've already chosen the best response.0
calculate the length of AB, giving your answer correct to one decimal place
 one year ago

shandelmanBest ResponseYou've already chosen the best response.1
Are you allowed to use the law of cosines?
 one year ago

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

shandelmanBest 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.
 one year ago

virtusBest 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
 one year ago

shandelmanBest ResponseYou've already chosen the best response.1
...I didn't get a whole answer, but I also didn't get 7.2. Hmm...
 one year ago

shandelmanBest 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)
 one year ago

virtusBest ResponseYou've already chosen the best response.0
oh i must have made a mistake then! THANKS
 one year ago

virtusBest ResponseYou've already chosen the best response.0
I get 13.8 for some reason
 one year ago

ganeshie8Best ResponseYou've already chosen the best response.0
put the calculator in degrees measure.. .
 one year ago
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