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if you have any two sides, you can calculate either of the (non right angle) angles.

if you have a (non right angle) angle and one side, you can calculate any other side.

you will need either tables, or a scientific calculator with sin / cosine / tangent

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Q: When finding the sides and angles of a right triangle when is it necessary to use Trigonometry?
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Is a triangle still a triangle if it has 2 obtuse angles?

In spherical trigonometry this is possible


What is Principle of trigonometry?

The basic principle of trigonometry is that there are mathematical relationships between the sides and angles of a triangle.


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Use trigonometry depending on what type of triangle it is.


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No it is the study of how the sides and angles of a triangle are related to each other


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With a protractor or use trigonometry if you know its dimensions


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The answer depends on what information you have about the other sides and angles.


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