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Triangles
Pythagoras
Right angled triangles appear all over the place in physics:
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If you know the length of two sides then you can find the length of the third
Pythagoras: Example A
This example shows how you can find the length of the third side of a triangle.
Trigonometry (Sin, Cos and Tan)
If you have a right angled triangle then you can do clever things:
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If you know the length of one side and an angle you can calculate another side
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If you know two sides you can calculate an angle
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Once you know one angle, or two sides, you can calculate the other angle and other side
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