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The applet Triangle and Law of Sines
emphasizes that the mathematical symbols denoting lengths,
angles and trigonometric functions in a triangle stand for concrete numbers.
Furthermore, it illustrates (two versions of) the Law of Sines. Note that the
applet does not provide a proof of the latter.
For a multimedia proof see
The Law of Sines
by Math Education and Technology.
The applet is started from the red button in its own window. Also see the learning units under Trigonometric functions
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