UNIT OVERVIEW

In Grade 10, you learned to solve right-angled triangles using SOHCAHTOA. But most triangles in the real world do not have a right angle. This unit gives you tools that work for ANY triangle.

In this unit, you will learn:

• The Sine Rule and how to prove it
• The Cosine Rule and how to prove it
• The Area Rule for finding the area of any triangle
• How to solve bearing (navigation) problems
• How to work with angles of elevation and depression
• How to choose the correct rule for different problems

Why this matters:

• Surveyors use these rules to measure land boundaries
• Pilots calculate flight paths using bearings and distances
• Architects design roof structures using triangle calculations
• Engineers plan cell tower placement for network coverage

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