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

To the nearest degree, m∠A ≈

Revolt · Accepted Answer

78°

Question 3

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 4

✔ SSSSASSAA

Revolt · Accepted Answer

✔ SSS

Question 5

After working through the problem above, we get cos(A) = [___] ⇒ 0.2.

Revolt · Accepted Answer

0.2

Question 6

Find the value of x to the nearest tenth.Which of the following equations correctly sets up the law of cosines to solve for x?

Revolt · Accepted Answer

Answer image: //media.edgenuity.com/EVresources/3111-14-52-10-10-task/mc001-2.jpg

Question 7

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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