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  • * Any two opposite sites of the quadrilateral are antiparallel with respect to the other two opposite sites.
    1 KB (162 words) - 19:39, 9 March 2024
  • <math>B'C'</math> and <math>B_1C_1</math> are antiparallel to BC with respect <math>\angle BAC \implies B'C' ||B_1C_1.</math> *[[Symmedian and Antiparallel]]
    59 KB (10,203 words) - 03:47, 30 August 2023
  • *[[Antiparallel]]
    19 KB (3,291 words) - 12:44, 6 October 2024
  • ...nd <math>F, A</math> and <math>A'</math> are inscribed, <math>FE</math> is antiparallel to <math>BC</math> with respect to angle <math>A</math> (see <math>\boldsym ...\angle AFE = \pi – \gamma (AA'EF</math> is cyclic, <math>FE</math> is antiparallel),
    7 KB (1,145 words) - 09:29, 18 June 2023
  • Well known that <math>EF</math> is antiparallel <math>BC</math> with respect <math>\angle A.</math> ...LM</math> is the bisector of <math>AO,</math> therefore <math>LM</math> is antiparallel <math>BC</math> with respect <math>\angle A</math>
    10 KB (1,751 words) - 14:34, 25 November 2022
  • <math>B'C'</math> and <math>B_1C_1</math> are antiparallel to BC with respect <math>\angle BAC \implies B'C' ||B_1C_1.</math>
    1 KB (249 words) - 14:44, 18 November 2022
  • ...N</math>, which is equivalent to <math>AB</math> and <math>CD</math> being antiparallel, in other words, we only need to prove that <math>ACDB</math> is cyclic:
    2 KB (306 words) - 10:19, 5 May 2024
  • <math>B'C''</math> is antiparallel to <math>BC.</math> Similarly, <math>A''C'</math> is antiparallel to <math>AC, A'B''</math> is antiparallel to <math>AB.</math>
    4 KB (731 words) - 05:34, 4 August 2024
  • <math>PQ \perp SQ, PQ' \perp SQ \implies PQ' </math> is antiparallel <math>PQ</math> in <math>\triangle SPQ.</math>
    39 KB (6,959 words) - 14:26, 3 December 2024
  • ==Antiparallel lines and segments== Two lines <math>BC</math> and <math>B'C'</math> are said to be antiparallel with respect to the sides of an angle <math>A</math> if they make the same
    30 KB (5,152 words) - 16:38, 6 August 2024