Welcome :: Homework Help and Answers :: Mathskey.com

Recent Visits

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

13,435 questions

17,804 answers

1,438 comments

774,867 users

Use the Law of Cosines. Find b to the nearest tenth.

0 votes
Use the Law of Cosines.  Find b to the nearest tenth. 
Triangle ABC with the measure of angle B = 48, the side opposite angle C = 85, and the side opposite angle “A” = 60.
A. 102.2
B. 62.4
C. 132.9
D. 63.2
Find the area of the triangle. Give the answer to the nearest tenth. The drawing may not be to scale. 
A triangle with one angle equal to 70 degrees.  The sides of that angle are 9 cm and 15 cm.
A. 126.9 cm2
B. 63.4 cm2
C. 23.1 cm2
D. 185.5 cm2
In triangle JKL, j = 9 inches, k = 5 inches and the measure of angle L = 43.  Find the measure of angle J.
A. 28º
B. 59º
C. 32º
D. 105º

 

asked Oct 7, 2014 in TRIGONOMETRY by tonymate Pupil

1 Answer

0 votes

Find the value of b by using the cosine rule:

b² = a² + c² - 2ac cosB

From the figure:

a = 60, c = 85, and B = 48°

b² = 60² + 85² - 2*60*85 cos(48°)

      = 3999.87

b = 63.244 63.2

So option D is correct

answered Oct 8, 2014 by bradely Mentor
edited Oct 8, 2014 by bradely

Related questions

...