THE LAW OF SINES AND COSINES

JEOPARDYMrs. BELCHER

Math 4

Directions• Each person should work out every

problem on their paper• Rotate through your group who works

the problem on the white board and displays the answer to earn points

• Don’t hold up your white board until I ask for them

• Every team that gets the correct answer earns points

• Each team needs to keep their own score

JEOPARDYSINE OF THE

TIMESIT’S OK…THEY’RE COSINES

HOW MANY SOLUTIONS?

KEEP ON A SOLVIN

100 100 100 100200 200 200 200300 300 300 300400 400 400 400

SINE OF THE TIMES 100• If A = 63°, B = 19°, and a = 2.4,

find b to the nearest tenth using the Law of Sines.

A. 0.9 C. 6.6B. 0.7 D. 3.6

SINE OF THE TIMES 200• If B = 14°, C = 45°, and b = 5.2,

find c to the nearest tenth using the Law of Sines.

A. 1.8 C. 15.2B. 6.1 D. 0.9

SINE OF THE TIMES 300• If a = 12, B = 27°, and b = 15,

find A to the nearest degree using the Law of Sines.

A. 132° C. 35° B. 21° D. 118°

SINE OF THE TIMES 400• If A = 50°, b = 10, and a = 14,

find C to the nearest degree using the Law of Sines.

A. 57° C. 33°B. 73° D. 97°

IT’S OK… THEY’RE COSINES 100

• If a = 21.5, b = 13, and C = 39°, find c to the nearest tenth using the Law of Cosines.

A. 7.5 C. 21.9

B. 14.1 D. 4.4

IT’S OK… THEY’RE COSINES 200

• If A = 52°, b = 54 and c = 49, find a to the nearest tenth using the Law of Cosines.

A. 3.9 C. 45.3B. 56.2 D. 78.6

IT’S OK… THEY’RE COSINES 300

• If a = 3, b = 7 and c = 5, find B to the nearest degree using the Law of Cosines.

A. 120° C. 22° B. 38° D. 90°

IT’S OK… THEY’RE COSINES 400

• If a = 5, b = 6, and c = 8, find A to the nearest degree using the Law of Cosines.

A. 141° C. 39°B. 124° D. 20°

HOW MANY SOLUTIONS 100• Determine the number of

possible solutions, given a = 33, b = 50 and A = 132°

A. NoneB. OneC. Two

HOW MANY SOLUTIONS 200• Determine the number of

possible solutions, given b = 150, a = 125 and A = 25°

A. NoneB. OneC. Two

HOW MANY SOLUTIONS 300• Determine the number of

possible solutions, given A = 38°, B = 63°, and c = 15

A. NoneB. OneC. Two

HOW MANY SOLUTIONS 400• Determine the number of

possible solutions, given b = 15, c = 13, and C = 50°

A. NoneB. OneC. Two

KEEP ON A SOLVIN’ 100• In order to solve the triangle given

b = 40, c = 45, and A = 51°, which equation should you use first to solve.

A. a² = b² + c² - 2bc·cos AB. b² = a² + c² - 2ac·cos BC. c² = a² + b² - 2ab·cos CD. Law of Sines

KEEP ON A SOLVIN’ 200• If B = 41°, C = 52°, and c = 27,

find a to the nearest tenth.

A. 22.5 C. 37.6B. 34.2 D. 23.9

KEEP ON A SOLVIN’ 300• If A = 52°, b = 12, and c = 16,

find B to the nearest degree.

A. 80° C. 85°B. 43° D. 48°

KEEP ON A SOLVIN’ 400• If A = 53°, b = 40, and c = 49,

find C to the nearest degree.

A. 15° C. 75°B. 52° D. 83°

CORRECT!!!!GOOD JOB!!!

GO BACK TO THE BOARD

AND CHOOSE ANOTHER

QUESTION!!!

INCORRECT!!!!SORRY!

GO BACK TO THE

QUESTION AND TRY AGAIN!

CORRECT!!!!GOOD JOB!!!

GO BACK TO THE BOARD

AND CHOOSE ANOTHER

QUESTION!!!

INCORRECT!!!!SORRY!

GO BACK TO THE

QUESTION AND TRY AGAIN!