Cosine Rule
Introduction
Introduction
The Cosine Rule is given by the formula:
The Cosine Rule is given by the formula:
a2 = b2 + c2 – 2 bc cosA
This formula can also be expressed in the form:
This formula can also be expressed in the form:
Explore!
Explore!
Use the applet below to explore the proof of the Cosine Rule.
Use the applet below to explore the proof of the Cosine Rule.
Click on Animate to begin.
Click on Animate to begin.
Test Yourself!
Test Yourself!
Use the applet below to test your understanding of cosine rule.
Use the applet below to test your understanding of cosine rule.
Next: Let's apply what we have learnt in bearings.
Next: Let's apply what we have learnt in bearings.