X1319

BEVAN-SCHRÖDER POINT

X1319 = circumcircle-inverse of X56
< A B C >: Reference Triangle △ABC [ A B ]: Sideline AB (Base c = 1) [ B C ]: Sideline BC (Side a) [ C A ]: Sideline CA (Side b) { 1, 3 }: OI Line (Incenter–Circumcenter Line) { 11, 515 }: Central Line L(11, 515) { 59, 518 }: Central Line L(59, 518) { 37, 604 }: Central Line L(37, 604) { 214, 519 }: Central Line L(214, 519) { 226, 535 }: Central Line L(226, 535) A = Vertex A (0.0000, 0.0000) B = Vertex B (1.0000, 0.0000) C = Vertex C (0.6122, 0.5999) X_1 = INCENTER (0.5714, 0.2333) X_3 = CIRCUMCENTER (0.5000, 0.1021) X_11 = FEUERBACH POINT (0.7347, 0.0667) X_515 = ISOGONAL CONJUGATE OF X(102) (0.6804, 0.7691) X_59 = ISOGONAL CONJUGATE OF X(11) (0.5333, 0.4355) X_518 = ISOGONAL CONJUGATE OF X(105) (0.9154, 0.6489) X_37 = CROSSPOINT OF INCENTER AND CENTROID (0.5567, 0.2158) X_604 = -CEVA CONJUGATE OF X(31) (0.6442, 0.3744) X_214 = -CEVA CONJUGATE OF X(44) (0.3571, 0.3499) X_519 = ISOGONAL CONJUGATE OF X(106) (0.9566, 0.6107) X_226 = -CEVA CONJUGATE OF X(65) (0.5778, 0.2588) X_535 = DIRECTION OF VECTOR AX + BX + CX, where X = X(36) (0.8224, 0.7130) X_1319 = BEVAN-SCHRÖDER POINT (0.9524, 0.9331) A B C X1 X3 X11 X515 X59 X518 X37 X604 X214 X519 X226 X535 X1319 (a, b, c) = (5, 6, 7) | AB = 1

X1319 (BEVAN-SCHRÖDER POINT) constructed on acute reference triangle \((a, b, c) = (5, 6, 7)\) with unit baseline AB = \(1\).

Constructed Elements

Trilinears: \((b + c - 2a)/ (b + c - a) : :\)
Barycentrics: \(a (2 a - b - c) \cdot (a + b - c) \cdot (a - b + c) : :\)
Search Value (6, 9, 13): \(-0.442489138601\)
▸ Alternate Coordinates1 form
  • Trilinears: \(2 - 2 \cos A - \cos B - \cos C\)

▸ Linear Combinations2 combinations

X1319 lies on the curves K338, K826, K1160, and Q071.

▸ Incident Central Lines563 lines

{1, 3}, {2, 3476}, {4, 7704}, {5, 45287}, {7, 2320}, {8, 6049}, {10, 5433}, {11, 515}, {12, 1125}, {19, 37519}, {20, 12701}, {21, 1408}, {30, 1387}, {33, 37391}, {34, 1878}, {37, 604}, {41, 40133}, {42, 1450}, {44, 1404}, {48, 1108}, {59, 518}, {63, 5289}, {72, 8666}, {73, 1104}, {77, 1122}, {78, 12513}, {79, 31776}, {80, 3582}, {85, 24805}, {100, 3880}, {101, 2348}, {104, 2720}, {105, 14733}, {106, 1168}, {108, 953}, {109, 2718}, {140, 10039}, {145, 1788}, {198, 3554}, {210, 956}, {214, 519}, {221, 1616}, {222, 16483}, {223, 16485}, {225, 23675}, {226, 535}, {227, 3924}, {238, 9282}, {269, 35227}, {278, 5146}, {279, 24796}, {329, 34610}, {348, 24798}, {355, 499}, {376, 30305}, {381, 23708}, {388, 2478}, {392, 993}, {404, 4861}, {405, 9850}, {442, 10957}, {474, 3698}, {495, 38028}, {496, 10572}, {497, 5731}, {513, 663}, {516, 15326}, {528, 30379}, {529, 908}, {536, 43135}, {553, 51103}, {572, 38855}, {595, 1399}, {603, 3915}, {611, 38029}, {614, 37366}, {651, 3246}, {664, 1447}, {672, 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{5219, 11237}, {5220, 30318}, {5248, 12709}, {5261, 46934}, {5270, 5443}, {5288, 34790}, {5432, 10165}, {5439, 30147}, {5441, 31795}, {5450, 12672}, {5453, 13391}, {5541, 41702}, {5550, 10588}, {5552, 32049}, {5572, 30284}, {5577, 33902}, {5691, 10896}, {5718, 6176}, {5724, 24239}, {5745, 31157}, {5784, 42842}, {5790, 37708}, {5794, 10527}, {5844, 12735}, {5853, 41555}, {5854, 51433}, {5887, 32153}, {5901, 12047}, {5905, 34647}, {6020, 12265}, {6224, 37797}, {6285, 12262}, {6502, 7969}, {6604, 17081}, {6647, 20335}, {6691, 24982}, {6700, 21031}, {6880, 7967}, {6882, 38032}, {6906, 45776}, {7051, 7052}, {7117, 8608}, {7173, 19925}, {7175, 16484}, {7178, 48328}, {7181, 9436}, {7191, 35996}, {7223, 40719}, {7235, 39766}, {7247, 17084}, {7284, 28444}, {7292, 14513}, {7340, 47376}, {7355, 40658}, {7491, 39599}, {7672, 15570}, {7741, 18480}, {7951, 11230}, {7972, 22935}, {8077, 10506}, {8227, 9613}, {8283, 21147}, {8286, 36195}, {8607, 47434}, {8649, 49758}, {8983, 19028}, {9318, 44664}, 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{36926, 37758}, {36944, 38462}, {37006, 37718}, {37139, 39308}, {37168, 37790}, {37728, 50824}, {37815, 45272}, {39870, 39873}, {39897, 49511}, {41389, 51506}, {43052, 48344}, {43054, 49768}, {43820, 43822}, {45398, 45404}, {45399, 45405}, {45500, 45506}, {45501, 45507}, {48894, 49745}, {50148, 51345}, {50594, 50604}, {51625, 51628}, {51627, 51629}

▸ Functional Relations29 relations

Notes

Let X'Y'Z' be the pedal triangle of the Bevan point, W = X40; then X1319 is the point, other than W, in which the circles AWX’, BWY’, CWZ’ concur. (Floor van Lamoen, Hyacinthos #6321, 6352).

  1. The Helman line is the radical axis of the Zaslavsky pencil, containing the circumcircle and incenter (A. Zaslavsky, August, 2022)

  2. the isogonal image of the Helman line is the I-centered circumellipse having semiaxes of lengths 2R(R-r+d) and 2R(R-r-d), where d = |OI. Accordingly, over Chapple’s porism (with fixed R an r), the I-circumellipse rotates rigidly about its center. (D. Reznik et al., August, 2022). See GeoGebra sketch

  3. Over Chapple’s porism, the locus of each point on the Helman line is a circle, called a Skutin circle, of radius R. (D. Reznik, August, 2022). This is a special case of a result in A. Skutin, “On Rotation of Isogonal Point”, J. Classical Geom., vol 2, 2013.

  4. The set of Skutin circles corresponding to all the points on a given circle in the Zaslavsky pencil all have the same radius. The locus of the center is a circle. (D. Reznik, August, 2022). See GeoGebra sketch