Cosine Rule

What rule should you use?

• Sine
• Cosine

Tags

CCSS.HSG.SRT.D.10

CCSS.HSG.SRT.D.11

What is the measure of angle A?

• 50 degrees
• 60 degrees
• 78 degrees
• 74 degrees

Tags

CCSS.HSG.CO.C.10

Which of the following formulas is the Cosine rule?

• c² = a² + b² - 4ac + cosA
• c² = a² - b² - 2abcosC
• c² = a² + b² - 2abcosC
• (cos A)/a = (cos B)/b

Tags

CCSS.HSG.SRT.D.10

CCSS.HSG.SRT.D.11

Find the unknown side length, c.

• 6.52

• 6.38

• 6.91

• 6.67

Tags

CCSS.HSG.SRT.C.6

CCSS.HSG.SRT.C.8

CCSS.HSG.SRT.D.11

In the ABC we have AB = 5cm, AC = 6cm, α = 60°. Find the length of the side BC.

• √31cm

• √29cm

• √25cm

• √15cm

Tags

CCSS.HSG.SRT.D.10

CCSS.HSG.SRT.D.11

Find the missing angle θ

• 27.9^o

• 29.2^o

• 26.8^o

• 45^o

Tags

CCSS.HSG.SRT.D.11

CCSS.HSG.SRT.D.10

Find the missing side x

• 60.5mm

• 10.3mm

• 30.1mm

• 58.1mm

Tags

CCSS.HSG.SRT.D.10

CCSS.HSG.SRT.D.11

Find the length of BC using Cosine Rule.

• 626.70

• 25.03

• 313.35

Tags

CCSS.HSG.SRT.D.10

CCSS.HSG.SRT.D.11

We can use SOH-CAH-TOA for...

• Any triangle ever
• Non-right triangles only
• Right Triangles only
• Never

Tags

CCSS.HSF.TF.A.3

CCSS.HSG.SRT.C.6

CCSS.HSG.SRT.C.7

CCSS.HSG.SRT.C.8

Find the missing side x

• 2.36cm

• 9.21cm

• 3.16cm

• 4.51cm

Tags

CCSS.HSG.SRT.D.11

CCSS.HSG.SRT.D.10