Law of Cosines

Question 1

The law of cosines is used to find the measure of .

Revolt · Accepted Answer

44º

Question 2

Law of cosines: a2 = b2 + c2 – 2bccos(A)

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34°

Question 3

On a softball field, home plate is 43 feet from the pitcher’s mound. A ball is hit at an angle of 27° east of the pitcher’s mound. The ball travels 162 feet before it is caught by an outfielder. Law of cosines:

Revolt · Accepted Answer

125 feet

Question 4

Law of cosines: a2 = b2 + c2 – 2bccos(A)

Revolt · Accepted Answer

22

Question 5

On which triangle can the law of cosines be applied once to find an unknown angle measure?Law of cosines: a2 = b2 + c2 – 2bccos(A)

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Triangle W X Y is shown. The length of W X is 10, the length of X Y is 8, and the length of W Y is 16.

Question 6

Law of cosines: a2 = b2 + c2 – 2bccos(A)

Revolt · Accepted Answer

13

Question 7

The law of cosines is used to find the measure of .

Revolt · Accepted Answer

51º

Question 8

A boat traveled north for 28 miles, then turned x° southwest and traveled for 25 miles before stopping. When it stopped, the boat was 18 miles from its starting point. Law of cosines:

Revolt · Accepted Answer

39 degrees

Question 9

A parallelogram has side lengths of 13 and 17 and an angle that measures 64°.Law of cosines: a2 = b2 + c2 – 2bccos(A)

Revolt · Accepted Answer

16

Question 10

Law of cosines: a2 = b2 + c2 – 2bccos(A)

Revolt · Accepted Answer

33°

Law of Cosines Answers

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