Law of Cosines Answers

4 verified answers1 views

In ΔDEF, DE = 11, EF = 9, and angle E = 140°. Which equation correctly uses the law of cosines to solve for the third side?

e2 = 112 + 92 − 2(11)(9)cos(140°)

112 = e2 + 92 − 2e(9)cos(140°)

92 = e2 + 112 − 2e(11)cos(140°)

e = 11 + 9 − 2(11)(9)cos(140°)

ΔDEF is an isosceles triangle with base angles E and F.

Answers:

Blank 1:14

Blank 2:83

Question text not available

Answer:

⇒ 7.7

Answer:

113571

Did you find these answers helpful?

More from this Course