Miquel-Steiner’s point locus Polygon ABDC is a concave quadrilateral. Four circumscribed circles are shown here, and we can find a point(M) where all circles meet. You can move the red vertices by dragging. --- 日本語 --- ミケル・シュタイナーの点 凹四角形ABDCに関する４つの三角形の外接円を描画すると４つの円が１点(M)で交わる。
Miquel and Steiner's Quadrilateral Theorem #math #triangle #circumcircle #circumcenter
