Inscribed Quadrilateral

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  1. If D lies on the segment BC, AED and ACD are congruent.
    Then these angles can be said to be inscribed in the arc .
    The four points A, C, D, and E lie on the circle with the center point G which is the center of gravity of ADE.
  2. If D is out of the segment BC, AED and ACD are supplementary.
    Then these angles can be said to be the opposite angles of the inscribed quadrilateral in the circle with the center point G.
In fact, if D is any point on the lay , ACDE is always inscribed in the circle with the center point G.