Exploring the Law of Sines and Cosines in Geometry

What is the formula for the area of a triangle using side B and angle A?

• 1/2 BC sin A

• 1/2 AB sin C

• 1/2 AC sin B

• BC sin A

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CCSS.HSG.SRT.D.9

Which sides are used in the formula 1/2 AC sin B?

• Sides A and C

• Sides B and C

• Sides A and B

• All sides A, B, and C

Tags

CCSS.HSG.SRT.D.9

How do you calculate the area of a triangle given sides B = 17, C = 19, and angle A = 135 degrees?

• 1/2 * 17 * 19 * sin(135)

• 1/2 * 17 + 19 + sin(135)

• 17 * 19 * sin(135)

• 1/2 * 17 * 19 * cos(135)

Tags

CCSS.HSG.SRT.D.9

What is the purpose of using the Law of Sines in triangle calculations?

• To find the hypotenuse of a triangle

• To calculate the area of triangles

• To find unknown angles or sides in non-right triangles

• To verify if a triangle is right

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CCSS.HSG.SRT.D.10

CCSS.HSG.SRT.D.11

In the Law of Sines, what does the proportion sin(angle A) / side A = sin(angle B) / side B represent?

• Calculation method for the area of a triangle

• Method to determine if angles are acute

• Formula for the hypotenuse in right triangles

• Relationship between angles and their opposite sides

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CCSS.HSG.SRT.D.10

CCSS.HSG.SRT.D.11

How do you find angle B if you know angle A = 115 degrees, side A = 20, and side B = 11?

• Subtract angle A from side B

• Add angle A to side B

• Multiply side A by side B and divide by sin(115)

• Set up the proportion using the Law of Sines and solve for angle B

Tags

CCSS.HSG.SRT.D.10

CCSS.HSG.SRT.D.11

What is the formula for the Law of Cosines to find side A?

• A^2 = B^2 + C^2 - 2BC cos(angle A)

• A^2 = B^2 + C^2 + 2BC cos(angle A)

• A = sqrt(B^2 + C^2 - 2BC cos(angle A))

• A^2 = B^2 - C^2 - 2BC cos(angle A)

Tags

CCSS.HSG.SRT.D.10

CCSS.HSG.SRT.D.11

Which formula is used in the Law of Cosines to find side B?

• B^2 = A^2 + C^2 - 2AC cos(angle B)

• B = sqrt(A^2 + C^2 - 2AC cos(angle B))

• B^2 = A^2 + C^2 + 2AC cos(angle B)

• B^2 = A^2 - C^2 - 2AC cos(angle B)

Tags

CCSS.HSG.SRT.D.10

CCSS.HSG.SRT.D.11

What does the Law of Cosines generally help to determine in a triangle?

• The area of the triangle

• Only the angles

• Unknown sides or angles

• Only the sides

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CCSS.HSG.SRT.D.10

CCSS.HSG.SRT.D.11

How is the Law of Cosines different from the Law of Sines?

• It is used to find the area of the triangle

• It is used when all sides are known but no angles

• It only applies to equilateral triangles

• It only applies to right triangles

Tags

CCSS.HSG.SRT.D.10

CCSS.HSG.SRT.D.11