HSC Together Year 12 Maths Standard: The Cosine Rule

#### Maths Standard

• Simultaneous Linear Equations
• Non-linear Relationships
• Non-Right Angled Trigonometry
• Rates and Ratios
• Investments and Loans
• Annuities
• Bivariate Data Analysis
• The Normal Distribution
• Network Concepts
• Critical Path Analysis
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# The Cosine Rule

### What is the cosine rule?

The cosine rule relates the sides and angles in a triangle. This post will explain the cosine rule in HSC Standard Math by going through the following:

• What is the cosine rule formula?
• How to use the cosine rule to calculate the SIDE of a triangle
• How to use the cosine rule to calculate the ANGLE of a triangle

### What is the cosine rule formula

The following videos explain the cosine rule formula.

### How do you use the cosine rule to calculate the SIDE of the triangle

The following video explains how to calculate the side of a triangle using the cosine rule.

### How do you use the cosine rule to calculate the ANGLE of the triangle

The following video explains how to calculate the angle of a triangle using the cosine rule.

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## 45,861 students have a head start...

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