Degenerate triangle |

If we combine the upper vertex of the triangle with the base, we get the second type of degenerate triangles. This segment equal to the sum of the other two segments. The sum of the angles are also equal to 180 degrees.

Degenerate triangle |

A degenerate triangle - is the lower limit of the application of the law of cosines. After that we will look at the law of cosines in general.

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