The notations in this table are as follows: In a convex quadrilateral ABCD, the diagonals intersect at P. R1, R2, R3, R4 are the circumradii in triangles ABP, BCP, CDP, DAP; h1, h2, h3, h4 are the altitudes from P to the sides a = AB, b = BC, c = CD, d = DA respectively in the same four triangles; e, f, g, h are the distances from the vertices A, B, C, D respectively to P; x, y, z, w are the angles ABD, ADB, BDC, DBC respectively; and Ra, Rb, Rc, Rd are the radii in the circles externally tangent to the sides a, b, c, d respectively and the extensions of the adjacent two sides for each side.