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Which of the following equations could be solved to determine the length of QR?
O A) QR2 = 202 + 272 - cos 99°
B) QR2 = 202 + 272 - 2(20)(27)
C) cos 99 cos R
QR
20
D) QR2 = 202 + 272 - 2(20)(27) · cos 99°

Which of the following equations could be solved to determine the length of QR O A QR2 202 272 cos 99 B QR2 202 272 22027 C cos 99 cos R QR 20 D QR2 202 272 220 class=

Respuesta :

Answer: D) QR^2 = 20^2 + 27^2 – 2(20)(27) ⋅ cos 99°

Step-by-step explanation:

since you have the lengths of two sides and their included angle, you can use the law of cosines to solve for the missing side. let a, b, and c be the side lengths, and A be side a's respective opposite angle:

the law of cosines states that

a^2 = b^2 + c^2 - 2bc ∙ cosA

hope this helped!

Answer:

d

Step-by-step explanation:

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