Some Important or Well Known Results
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The bridge of asses theorem states that if A=B then C=D.
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The sum of angles A, B, and C is equal to 180 degrees.
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Pythagoras' theorem: The sum of the areas of the two squares on the legs (a and b) of a right triangle equals the area of the square on the hypotenuse (c).
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Thales' theorem: if AC is a diameter, then the angle at B is a right angle.
Read more about this topic: Euclidean Plane Geometry
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