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ULTIMATE MATHS

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Example 1
In this example, we have used cosine rule to find the missing angle
A. We have substituted the values into the equation and simplified
it before using the inverse cosine function on the calculator to find
the missing angle.

Example 2
In this example, we have used cosine rule to find the missing side c
of the triangle. We have substituted the values into the equation and
simplified it before square rooting 451 to find the length of side c:
21.2 cm.

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Chapter 31.3: Learning Outcomes
Students will learn how to find missing angles of non right-angled
triangles using cosine rule!
Students will learn how to find missing sides of non right-angled triangles
using cosine rule!

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