Law of Cosines

Question 1

Assume that Q, R, and S are the angles of a triangle, with opposite sides q, r, and s respectively. Select all of the following that represent the law of cosines.

Revolt · Accepted Answer

q2 = r2 + s2 – 2rscos(Q); r2 = q2 + s2 – 2qscos(R); s2 = q2 + r2 – 2qrcos(S)

Question 2

SAS is given, and the unknown measure, b, is a side length.SSA is given, and the unknown measure, b, is a side length.SSS is given, and the unknown measure, b, is an angle measure.ASA is given, and the unknown measure, b, is an angle measure.

Revolt · Accepted Answer

SAS is given, and the unknown measure, b, is a side length.

Question 3

⇒ 0.2

Revolt · Accepted Answer

0.2

Question 4

✔ SSSSASSAA

Revolt · Accepted Answer

✔ SSS

Question 5

39°63°✔ 78°80°

Revolt · Accepted Answer

✔ 78°

Question 6

The value of x, rounded to the nearest tenth is ⇒ 6.6.

Revolt · Accepted Answer

6.6

Law of Cosines Answers

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