Use the law of cosines to find the value of cos. (see pic attached inside!!) Round the answer to two decimal places! A. 0.84 B. 0.35 C. 0.23 D. 1.23

Question

asked May 12, 2017 151k views

2 Answers

Michael Csikos · Answer 1 · 2017-05-13T23:53:24+0000

Answer:

The CORRECT anser is 0.22

Explanation:

I took the test and I got stumped, so I checked here and the answer that was provided was WRONG!!!

FattRyan · Answer 2 · 2017-05-18T11:57:31+0000

Answer:

Option A) 0.84

Explanation:

Given is a triangle with sides 10.2, 9.8 and 5.7

We are to find the angle opposite the side 5.7

We can use cosine law for triangles

$5.7^2=10.2^2+9.8^2-2(10.2)(9.8) cos\theta$

Simplify to get

$32.49=104.04+96.04-199.92cos\theta$

Simplify to get

$cos \theta =08382$

Round off to get 0.84

Hence option A is right answer