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

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

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

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

shandelman
 3 years ago
Best ResponseYou've already chosen the best response.1I'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.

virtus
 3 years ago
Best 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

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

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

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

virtus
 3 years ago
Best ResponseYou've already chosen the best response.0I get 13.8 for some reason

ganeshie8
 3 years ago
Best ResponseYou've already chosen the best response.0put the calculator in degrees measure.. .
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