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You are here: Home / Category Index / Trigonometry / The Cosine Rule
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The Cosine Rule - By Mary Howlett
How to use this applet:To use the applet, you must click on the button to display the first two triangles and then click on the button a second time to display the third triangle which illustrates the cosine rule. When you click on the button for the first time it will also change the screen from a dark purple to a darker colour.Notes on the maths used in the applet:The maths needed in this applet were in relation to the cosine rule which included the formula:
a^2 = b^2 + c^2 - 2bccosA
b^2 = a^2 + c^2 - 2accosB
c^2 = a^2 + b^2 - 2abcosC
I also worked out the sídes and angles needed in the three triangles.
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