Question

Use the Law of Cosines. Find length x.

(Round the final answer to one decimal place as needed. Round all intermediate values to two decimal places as needed.)

Answer 1

18.2

Explanation:

AB² =AC² + CB² -2(AC)(CB)CosA

X²=(17)² + (10)² - 2 (17)(10) Cos80

x² = 289 + 100- 340 cos 80

x= √289+100-340cos80

x= 18.2