三角形的旁切圆

escribed circle excess of a triangle circumference of a circle quadrature of a circle great circle of a sphere angular excess of a small geodesic triangle solving a triangle closed triangle of forces triangle of vectors homologous part of triangle error of closure of triangle argue in a circle inscribed circle of a triangle altitude of a triangle vertex of a triangle circumcentre of a triangle center of a circle arc of a circle radius of a circle equation of a circle diameter of a circle area of a circle