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3.3 Law Of Sines

In triangle ABC, seg is the altitude in each fig.

\ D ADC and D BCD are right triangles. Thus

sin A = \ h = b sin A in fig.23A

sin ( p - B) = sin B = \ h = a sin B.

In follows that from fig.23.B

\ b sin A = h = a sin B

The Law Of Tangent

These results are also known as "Napier's Analogy."

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3. 1 Solving Right Triangles
3. 2 Law of Cosines
3. 3 Law of Sines
3. 4 The Ambiguous Case of Law of Sines
3. 5 Areas of Triangles
Supplementary Problems

Chapter 4

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