Welcome :: Homework Help and Answers :: Mathskey.com
Welcome to Mathskey.com Question & Answers Community. Ask any math/science homework question and receive answers from other members of the community.

12,761 questions

17,393 answers

1,428 comments

33,429 users

If cosA=12/13 and cosB=5/13 find a:b:c

0 votes
This question is from properties of triangle
asked Apr 4 in TRIGONOMETRY by anonymous

1 Answer

0 votes

cos A =12/13,cos B =5/13

cos^2(A)+cos^2(B)+cos^2(C)=1

(12/13)^2+(5/13)^2+cos^2(C)=1

cos^2(C)=0

C =90

sinA =5/13

sin B =12/13

sin C =1

From properties of triangle.

a:b:c =sinA:sinB:sinC

        =(5/13):(12/13):1

        = 5:12:13

 

answered Apr 6 by chrisgirl Apprentice

Related questions

...