Theorems related to equilateral traingle :
Theorem 1: The sum of measures of all 3 interior angles of a triangle is [tex]180^0[/tex].
Theorem 2: The angles opposite to equal sides are also equal in measure.
Theorem 3: The sum of the related internal angles is the measure of the exterior angle of a triangle.
Theorem 4:If a line splits any two triangle sides in the same proportion, it is parallel to the third side of the triangle.
Theorem 5: Each angle of an equilateral traingle have equal measure of [tex]60^0[/tex].
To know more about internal angles click on below link:
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