Exploring the Law of Sines and Cosines

This video tutorial reviews the laws of sines and cosines, focusing on their application in solving triangle problems. It covers the basic formulas, explains how to use them in different triangle scenarios, and addresses the ambiguous case in the law of sines. The tutorial also provides examples and exercises to help students understand and apply these concepts effectively.

What does the Law of Sines relate in a triangle?

• Sides to their adjacent angles

• Angles to their adjacent sides

• Angles to their opposite sides

• None of the above

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CCSS.HSG.SRT.D.10

CCSS.HSG.SRT.D.11

What is the formula for the Law of Cosines?

• a^2 = b^2 - c^2 - 2bc cos(A)

• a^2 = b^2 + c^2 + 2bc cos(A)

• a^2 = b^2 - c^2 + 2bc cos(A)

• a^2 = b^2 + c^2 - 2bc cos(A)

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CCSS.HSG.SRT.D.10

CCSS.HSG.SRT.D.11

In which scenario is the Law of Cosines particularly useful?

• When two angles and one side are known

• When one angle and two sides are known

• When three angles are known

• When all three sides of the triangle are known

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CCSS.HSG.SRT.D.10

CCSS.HSG.SRT.D.11

Which law would you use when you know two sides and the included angle?

• Law of Sines

• Pythagorean Theorem

• None of the above

• Law of Cosines

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CCSS.HSG.SRT.D.10

CCSS.HSG.SRT.D.11

What does the Law of Cosines equate?

• None of the above

• Both A and B

• The product of the sides and cosine of the included angle

• The squares of the sides of a triangle

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CCSS.HSG.SRT.D.10

CCSS.HSG.SRT.D.11

How can triangles be proven congruent using side lengths?

• Side-Angle-Side (SAS)

• Angle-Side-Angle (ASA)

• All of the above

• Side-Side-Side (SSS)

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CCSS.HSG.SRT.B.5

What is required to use the Law of Sines effectively?

• Two sides and the opposite angle

• Two angles and the opposite side

• One side and any two angles

• Knowledge of all three sides

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CCSS.HSG.SRT.D.10

CCSS.HSG.SRT.D.11

What does an ambiguous case in triangle solutions refer to?

• A scenario where triangle sides do not conform to the laws

• A case where no triangles can be formed

• A case where only one triangle solution is possible

• A situation where multiple triangle configurations are possible

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CCSS.7.G.A.2

How do you handle an ambiguous case in triangle solutions?

• Consult a geometric chart

• Ignore the possibilities and use average values

• Calculate all possible solutions

• Use only the Law of Cosines

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CCSS.HSG.SRT.C.8

When solving triangles, what does an ambiguous case typically involve?

• A single solution with clear measurements

• Multiple solutions due to the angle-side-side configuration

• Solutions that only apply to right triangles

• No possible solutions due to lack of data

Tags

CCSS.HSG.SRT.D.10

CCSS.HSG.SRT.D.11